tool Sharpener. 1-material:aluminum oxide 2-shank: 1/4" or 6mm 3-application:all kinds of knifes and blades you use... tool Sharpenergarden tool sharpener.With your new sharpener, you will be able to sharpen all kinds of knifesand blades you use in your garden.Particularly for grass cutter it is often a problem to decide if a new knifeis necessary or not. With this sharpener, however, you can ...