Lansky Master's Edge 5 Rod Sharpener Professional Machine The last stone is the

The last stone is the Fine India Stone which is made of aluminum oxide

even on hard steel

This is a tool that is meant to be used in a home kitchen

Dick's 1905 line

For metric folks

Lansky Master's Edge 5 Rod Sharpener Professional Machine The last stone is theSharpen Straight and Serrated Knives! The Master's Edge Sharpening System includes a pair of both medium (gray) and fine (white) ceramic rods for sharpening and professional grade polishing. Also included in the system is the new medium ceramic triangular rod which will sharpen many types of serrations as well as awls and fish hooks. Features three of the most common sharpening angles: 17, 20 and 25, a rubber non slip base, easy snap in rod storage,