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Hands rolling the Tumbler Pro Rolling Knife Sharpener along the edge of a kitchen knife on a wooden cutting board

Are Pull-Through Knife Sharpeners Bad for Your Knives?

  • November 5, 2026
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  • Team Tumbler
Hands rolling the Tumbler Pro Rolling Knife Sharpener along the edge of a kitchen knife on a wooden cutting board

By Team Tumbler

For a good knife, usually yes. A pull-through drags the edge through two abrasives in a fixed V, scraping both sides at once at an angle that may not match the knife. Carbide notches take steel off fast, and uneven pressure reshapes the edge. For knives worth keeping, use a guided sharpener like the Tumbler Rolling Knife Sharpener.

Watch on Instagram

In this @tumblerusa reel, captioned "Will the Tumbler ruin my expensive knives?", a black roller runs along a kitchen knife held still on a black angle block on an end-grain board, and the clip ends with a knife slicing into a tomato.

Everything below comes from knife makers, sharpening specialists and published guides, with a source next to each claim; we didn't run new hands-on tests. For the guided side of the story, see our guide to how rolling knife sharpeners work.

How a pull-through sharpener works

A pull-through sharpener is two hard abrasive pieces crossed in a V inside a handle. You set the edge in the notch and draw the knife toward you, and each piece scrapes one side of the bevel during that single pass. The slot decides the angle. Your hand only controls pressure, speed and how level the blade stays.

Most use "two pieces of hardened material (typically Tungsten Carbide)," according to A.G. Russell Knives, whose guide offers a quick way to tell what you own: "two smooth dark metal-looking pieces in the V" almost always means carbide. Others use ceramic rods or wheels. Sharpener Stefan Lemley describes the whole category as dragging the edge through "a pair of angled edges" (SL Sharpening). Pull-through notches also turn up on can openers and in kitchen knife sets, and A.G. Russell's verdict on those is blunt: "Results on those can vary widely."

What does each type of notch do to your edge?

Every pull-through sharpens by scraping, but the notch material and the fixed slot decide how much harm it does. Carbide cuts fastest and takes the most steel. Ceramic is gentler but clogs. Any fixed slot regrinds a knife whose factory angle doesn't match it, and uneven pressure along the pull adds damage of its own.

What's in the notch What it does to the edge Knives it's hardest on Source
Carbide V (two dark, metal-looking pieces) Removes steel fast; carbide will "eat away material very quickly." The two carbide edges can "chatter" and leave "a wavy, almost serrated edge in places." Good knives you want to last; the aggressive action "can be damaging to high-quality or expensive knives" A.G. Russell, Outdoor Life, Sharpening Supplies
Ceramic rods or wheels Gentler: ceramic "doesn't eat away nearly as much material," but it "gets gunked up with the metal shavings it removes" and is very hard to clean Thin Japanese blades; ceramic wheels can "take chips and chunks out of thin Japanese blades" A.G. Russell, Chef's Armoury
Any fixed slot Grinds the angle the slot was built for, which "may not be ideal for every knife"; Outdoor Life says pull-through angles "are not adjustable, and are usually quite wide" Knives finished finer than the slot, such as Shun (16° per side) or Wüsthof PEtec (14.5° per side) Sharpening Supplies, Outdoor Life, Shun, Wüsthof
The pull itself (uneven pressure) Pressure changes from heel to tip, so the heel loses extra steel and "the edge tends to go out of shape" Long chef's and carving knives; "the larger the knife the more apparent this problem is" Chef's Armoury, A.G. Russell

The angle row is the one most owners never think about. Shun grinds its kitchen knives to 16° on each face, and Wüsthof says most kitchen knives from other makers sit at "about 20° per side" while its PEtec edge is 14.5°. Pull a fine-edged knife through a slot set wider than its factory angle, and every session grinds the edge a little closer to the slot's angle. Over months you end up with a new, blunter bevel. Our breakdown of 15° and 20° sharpening angles explains which angle fits which knife.

Single-bevel Japanese knives are the clearest no. A yanagiba, deba or usuba is ground on one side only, and Chef's Armoury warns a pull-through will "permanently damage any single sided blade" because the V grinds both faces. Double-bevel Japanese knives can still suffer, since many have "offset bevels" a symmetric slot can't follow. Our post on rolling sharpeners and Japanese knives explains how to tell which kind you have.

Some sharpening specialists go further. Lemley's post says pull-throughs "will absolutely damage your blades and give a terrible edge." That is one sharpener's opinion, but the sources above lay out the mechanisms behind it.

Pull-through sharpener vs rolling sharpener: is it the same thing?

No. Both set the angle for you, but a pull-through moves the knife through a stationary V, while a rolling sharpener clamps the knife still on a magnetic block and rolls a diamond disc along one face at a time. A separate honing disc then smooths the edge.

The objection is fair to raise. In a 2022 BladeForums thread, one commenter called the Tumbler Rolling Knife Sharpener a "dressed up version" of cheap pull-throughs that costs more, and another replied that it suits pull-through users who "need a performance upgrade" (BladeForums). The difference is mechanical:

  • The angle is chosen, not imposed. The Tumbler Original's magnetic holder "keeps your blade at 15° or 20° as you roll," so you can match a finer Japanese-style edge or a sturdier Western one. The Tumbler Knife Holder Pro adds 10° and 25°.
  • One side at a time. The disc works a single face of the edge, then you flip the knife, instead of two hard edges scraping at once.
  • The knife doesn't move. You roll the disc instead of dragging the blade, so the blade can't tip sideways halfway through a stroke.
  • A finishing stage. The EdgeBoost honing disc is steel on the Tumbler Original and ceramic on the Tumbler Pro.

Tumbler's own product pages call pull-throughs "Fast but aggressive" and warn they wear blades down. That's our view, so weigh it as such. Any sharpener removes some steel; the question is how much, and whether the angle you end up with is the one you meant.

Where a pull-through still makes sense

A pull-through earns its place on an inexpensive knife you'd replace rather than care for, like the old one in the camping bin or the garage workbench drawer. It's quick and cheap, and with a light hand it gets a dull edge cutting again. It isn't the tool for Japanese, single-bevel, thin, expensive or heirloom knives.

Even its critics give it credit. Sharpening Supplies says "These sharpeners are fast," and that carbide models are "incredibly user-friendly." A.G. Russell concedes a pull-through leaves "a usable edge" that can still slice paper when done right, then adds a caveat: "A V-Sharpener is a field sharpener and should be used as such."

If you keep one for beater knives, use it gently:

  • Light, steady pressure. Press too hard and "the blade will skip and create a jagged edge" (A.G. Russell).
  • Keep the blade upright and straight. Outdoor Life saw "deep gouges" on blades pulled through slightly tilted or crooked.
  • Fewer pulls, less often. On carbide, A.G. Russell warns, "there won't be much blade left if used too often."

Has a pull-through already damaged your knife?

Check the edge in good light and rest it on a cutting board. A gap near the heel, a profile that has drifted from the original shape, visible chips, or wavy, toothy patches are the usual signs. Most of that can be fixed by grinding a fresh edge, though deep damage costs some steel to remove.

What to look for, and why it happens:

  • A dip or inward curve near the heel. Set the edge flat on a board; light under the heel means a recurve. A.G. Russell traces this to uneven pressure that removes extra steel at the heel.
  • A changed profile. The edge line no longer follows the knife's original curve, the "out of shape" edge Chef's Armoury describes.
  • Chips. Chef's Armoury warns that ceramic wheels can chip thin Japanese blades.
  • Wavy, almost serrated stretches. Outdoor Life links these to carbide edges chattering along the steel.
  • An edge that feels sharp, then dies within a meal or two. Often a leftover burr; see the FAQ below. If a knife won't stay sharp whatever you use, these common reasons a sharpened knife still feels dull are worth checking.

Chips and a badly reshaped edge need a coarse abrasive first. On the Tumbler Pro, that's the Tumbler Coarse Diamond Disc #150, a repair disc for chips and dents; after it, go back to the standard diamond disc and then hone. Before you order one, check your roller: the #150 only mounts on a Tumbler Pro purchased after June 1, 2025, which has a small hex-shaped recess sitting just above its screw threads, and it can't be fitted to a Tumbler Original. A deep recurve at the heel takes more steel to even out, so expect a few sessions or a visit to a professional sharpener.

What to use instead

Use a sharpener that holds an angle you choose while the abrasive moves along a still blade. For most home cooks that's the Tumbler Original. For expensive, Japanese or specialty knives, it's the Tumbler Pro. A whetstone is the other good option if you want to learn freehand sharpening.

The Tumbler Pro steps up to a 4-layer diamond disc and a ceramic EdgeBoost honing disc, and its discs come off, so whetstone discs can follow later (same fit rule as the #150 above); Tumbler pitches it at cooks with "premium or specialty knives." The Tumbler Original keeps things simpler, with fixed discs. Our Tumbler Original vs Tumbler Pro comparison page lays the two side by side. Time depends on the knife: a neglected or very dull blade usually needs about 2 to 12 minutes, and a regular touch-up about 60 seconds.

Weighing the other routes? Our rolling sharpener vs whetstone comparison covers the freehand option, and our guide to rolling, electric and pull-through sharpeners puts all three types side by side. If a rolling sharpener's price gives you pause, read whether a rolling knife sharpener is worth it, and steer clear of cheap knockoff sharpeners, which cut many of the same corners in a rolling shape.

A rolling sharpener isn't for every blade, either. It doesn't handle serrated edges, and ceramic knives won't hold on the magnetic block, as Tumbler's FAQ page explains. Single-bevel knives need a different approach from a standard double-bevel edge.

FAQ

Do pull-through sharpeners leave a burr?

Usually, yes. Outdoor Life says these sharpeners "always leave a burr on one side of the edge," because the two carbides overlap and the second one raises a burr that nothing removes. The edge can feel sharp at first, but the burr "quickly folds over and kills the edge's performance."

Can a pull-through sharpener fix chips in a knife?

Only tiny ones. A.G. Russell says small nicks smooth out quickly in a V, but "larger nicks get caught in the V, making the nick worse." Bigger chips need a coarse abrasive that grinds the edge back past the damage.

How often should you use a pull-through sharpener?

As rarely as you can. Each pull removes steel, and carbide removes it fastest, so save it for when the knife has stopped cutting. Between sharpenings, hone instead; on a Tumbler honing disc, about 6 passes per side is plenty.

Sources

Written by Team Tumbler.