Design & Details: Adjustable sharpening angle offers repeatable accuracy with a 15 Adeg -30 Adeg range and 1 Adeg precision increments for an improved sharpening method Multi-sided tri-abrasive design offers course 320 grit diamond, fine 600 grit diamond, and fine ceramic stone built into the handle with easy switching between stones Extreme safety with a high-stability base and removable V-block clamp for an easy knife hold that offers securement and consistency.