Pick your angle preset, lock the knife on the magnet base, and roll the disc down the blade four times per side. Most first-timers finish in under five minutes, no experience needed.

Twelve degrees for Japanese sushi blades, fifteen for chef knives and santokus, seventeen for German-style chef knives, nineteen for utility and paring blades, twenty-two for heavy cleavers. The included guide lists common knife styles.

Sharp enough to slice a tomato by its own weight after one pass through both discs. An independent lab test took a knife from a dull 1044 to a razor-sharp 239 on the Edge-On-Up scale.

A whetstone can reprofile and mirror-polish, but it takes 20-45 minutes and steady hand skill most home cooks never build. EdgeRoll locks the angle by magnet, so you get a consistent working edge in minutes.

Yes — both discs screw on and off in seconds. When the diamond loses bite or the ceramic glazes over, you order a replacement disc instead of a whole new sharpener. Bonded-disc rollers cannot be swapped and become disposable.

N42-grade neodymium magnets retain over ninety-five percent of their flux density across five years of normal household use. Cheap copycats use weaker N35 or non-graded magnets that demagnetize from heat and steel contact.

No, the rolling disc is built for straight edges. Running it over serrations wears the scalloped teeth flat instead of sharpening them. Use EdgeRoll for every straight-edge knife in the block, from paring to chef.

Start with twelve to twenty passes on the 400-grit diamond disc — it removes microchips and restores a rolled tip in roughly two minutes. Then move to the 1000-grit polish for the working edge. Severe damage may need two sessions.