Angle Set Knife Sharpener is versatile & adjustable. The Tri-Brasive rods provide 3 abrasives contains a coarse grit diamond, medium grit diamond, & a fine grit ceramic; Sharpen & Hone any knife you own. Rods rotate for quick indexing. Sharpening Angles can be set to 15°, 17.5°, 20°, 22.5° or 25°. Tapered ceramic rod allows you to sharpen serrations & other edge tools. Designed with knife making legend Ken Onion.