- 30-day money back
- Holds 15°/20°
- Free shipping
- 400 grit + 3000 grit, both included
Rollkeen Rolling Knife Sharpener
Sharp knives, without learning to sharpen.
- 30-day money back
- Holds 15°/20°
- Free shipping
- 400 grit + 3000 grit, both included
Rollkeen Rolling Knife Sharpener
Sharp knives, without learning to sharpen.
$119 $49.50/ea unlocks with your email. Without it, it's $119 each.
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$49.50/ea
$119
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Free delivery in 3–8 business days
- Both grits included
- Runs dry
- No skill needed
Lay the knife on the block. Roll. The angle never moves, because you are not the one holding it.
Will it work on my knives?
The fridge-magnet test: touch a magnet to the blade. If it sticks, the block will hold it.
Works with chef’s knives, santokus and other Japanese knives (15° end), German and Western knives (20° end), utility and carving knives, and cleavers with the roller raised on a cutting board.
Not for serrated edges, ceramic blades, or paring, steak and pocket knives, which are too short to reach the disc.
How it works
Freehand, the angle wanders a few degrees without you feeling it — and a bevel that keeps changing its mind never comes to a point.
Both grits are on the roller — 400 grit on one end to bring back an edge that has been dull for years, 3000 grit on the other to finish it. Turn the roller over; there is nothing to swap and nothing else to buy.
Shipping, refunds & warranty
- Shipping
- Free from a US warehouse. Arrives 3–8 business days after you order.
- Refunds
- Thirty days from delivery, any reason. Refunded in full — no need to send it back.
- Warranty
- Optional lifetime warranty at checkout — a new sharpener free, for any reason, wear included, for as long as you own it.
Product specifications
- Roller
- 5.5 cm across, 8.4 cm tall, 380 g. Wooden body, steel rings.
- Angle block
- 10.4 × 5.7 × 2.4 cm. Wooden body on four rubber feet, with a magnetic rubber face at each end.
- Angles
- 15° at one end, 20° at the other. Turn the block round — there is nothing to adjust.
- Discs
- 400 grit diamond on one end of the roller, 3000 grit ceramic on the other. Turn it over — nothing to swap, no tools.
- Time
- The first sharpen takes longest, because it resets the edge to 15° or 20°. After that, a touch-up takes a few minutes.
- Magnet
- Neodymium, set beneath the rubber face.
- Use it on
- Full-size kitchen knives with a smooth edge — chef's, santoku, utility, carving. Full-bolster knives fit; the last bit of edge by the heel is hard to reach, as it is on a whetstone.
- Not for
- Serrated edges, and paring, steak or pocket knives — too short to reach the disc. The blade must be magnetic: touch a fridge magnet to it if you are unsure.
- Which end
- 20° if you do not know. 15° for Japanese knives and anything ground thin. Once a knife is cut to an angle, keep using that end.
- Caution
- Strong magnet — keep it away from pacemakers and bank cards.
- Care
- Runs dry — no water, no oil. Wipe the metal dust off the roller and shaft after use.
What to expect.
Sharpen a knife you use every day about once every two weeks and each sharpen takes a few minutes. A completely blunt knife, with no edge left, takes longer the first time while the roller grinds it a new one.
A real edge every time: the 400 grit sharpens it, the 3000 grit polishes it. No soaking, no setup.
Both included, one on each end of the roller. 400 grit diamond resets, 3000 grit ceramic polishes.
No water, no oil. Wipe the roller when done.
The discs wear slowly. The lifetime warranty replaces a worn one free.
Setting it up
How it works, in detail.
Quick: a sharp edge in a few minutes
Stand the knife on the magnet and it sits at exactly 15° or 20°, so every pass lands on the same edge. Roll along it on the 400 grit to sharpen, then on the 3000 grit to polish. Sharpen a knife you use every day about once every two weeks and each sharpen takes a few minutes.
A completely blunt knife, with no edge left, takes longer the first time while the roller grinds it a new one. After that, you're back to a few minutes.
- Exactly 15° or 20°, every pass
- A few minutes, about every two weeks
- A blunt knife's first sharpen takes longer
400 grit + 3000 grit, one on each end
Both discs come with it, one on each end of the roller. The 400 grit diamond end does the sharpening: it takes off enough steel to reset a dull edge. The 3000 grit ceramic end then polishes that edge smooth, so it slices instead of tearing. Turn the roller around to switch. When the knife glides through a tomato skin, you're done.
- 400 grit diamond: sharpens
- 3000 grit ceramic: polishes
- The tomato test tells you when to stop
Easy: no water, no oil, no soaking
A whetstone needs soaking, a flat surface and a rinse afterwards. This runs dry. Set the block on the counter, stand the knife on its magnet and roll. Only the edge touches the disc, and the blade rests on rubber, so it is never dragged through a slot the way a pull-through does it. When you're done, wipe the roller and put it away in a drawer.
- Runs dry: no water, no oil
- Wipe the roller when you're done
- Fits in a drawer
Long lasting, and replaced if it wears out
The discs wear slowly. Every abrasive wears a little each time it's used, but a knife that's sharpened regularly only needs a few light passes, so the discs last a long time. Grinding a new edge on a very blunt knife wears the 400 grit faster.
If yours does wear out, the optional lifetime warranty sends you a new one free. And if it isn't for you, email us within 30 days of delivery for a refund, with nothing to send back.
- The discs wear slowly
- Lifetime warranty: a new one if it wears out
- 30-day money back, nothing to send back
Will it work on your knives?
Works with
- Chef’s knives
- Santoku and other Japanese knives — use the 15° end
- German and Western knives — use the 20° end
- Utility and carving knives
- Cleavers and tall blades — raise the roller on a cutting board
- Full-bolster knives — the last bit of edge by the heel is harder to reach, just as on a whetstone
Not for
- Serrated edges
- Ceramic blades
- Paring, steak and pocket knives — too short to reach the disc
- Blades a magnet will not stick to
The fridge-magnet test. Touch a magnet to the blade. If it sticks, the block will hold it.
How it compares.
A steady whetstone angle, without the practice or the pull-through damage.
| Feature | Rollkeen | Pull-through | Whetstone |
|---|---|---|---|
| Skill needed | None | None | A lot |
| Same angle every stroke | |||
| Gentle on a good edge | |||
| Polishes to a fine edge | |||
| Water or soaking | None | None | Usually |
| A touch-up, once sharp | A few min | ~1 min | Needs practice |
Typical use of each method; times vary with the knife and how dull it is.
-
The rollerBoth included: the 400 grit end resets a dull edge, the 3000 grit end finishes it. -
The angle blockStick the knife to the 20° end, or turn the block round for 15°. -
The feetFour rubber feet keep the block still on a smooth counter.
Buying from us
Thirty days, or your money back.
Try it on your own knives. Not happy? Email us within 30 days of delivery and we refund you in full. Nothing to send back.
Add the optional lifetime warranty and we replace it free, for any reason, even wear.
Refunded to your original payment method.
Will it work on my knives?
Chef's, santoku, utility and carving knives with a smooth edge: yes. Serrated, ceramic, and short knives — paring, steak, pocket — no. The blade has to be magnetic: touch a fridge magnet to it, and if it sticks, the block will hold it. The block's magnet is strong: keep it away from bank cards, phones and anyone with a pacemaker, and keep it and sharp knives away from children.
Which angle should I use: 15° or 20°? Is it safe for a good knife?
20° for German and most Western knives, 15° for Japanese and other thin blades. If your knife is somewhere in between, use the nearest side; the first sharpen resets it. The block holds that angle on every pass, which is what keeps a good knife safe: only the edge touches the disc. If the knife is only a little dull, start on the 3000 grit side.
Does it get as sharp as a whetstone?
In skilled hands, a whetstone with very fine grits can go further. What most people actually get from a stone is an uneven edge, because the angle drifts. Rollkeen holds the angle on every pass, and that's most of what makes an edge sharp. For everyday cooking, the tomato test is the one that counts.
How long does it take?
Sharpen a knife you use every day about once every two weeks and it takes a few minutes: a few passes on the 400 grit, then the 3000 grit to polish. Bringing back a completely blunt knife, with no edge left, or a chipped one takes longer the first time, because the roller has to grind a new edge at 15° or 20° before it can polish it. After that first one, you're back to a few minutes.
Is there a warranty or return policy?
Both. Email us within 30 days of delivery and we refund the full price; you don't send anything back or give a reason. You can also add the optional lifetime warranty: a new sharpener, free, for any reason, including worn discs, for as long as you own it. Full terms
How long until it arrives?
Free from our US warehouse, and it arrives 3–8 business days after you order. Tracking when it leaves. It's made in China and shipped from the US.
