Crazydeal 1 Pc Grinding Wheels/knife Sharpener Useful Stylish Stone Abrader W Knife sharpener has two plastic wheels Perfect to have on in your toolkit to sharpen all kind of blades Compact carry-around design Super easy and intuitive operation, just slide in and roll. Simply slide the blade into the sharpener and roll it forward and backward a few times and your blade will be shiny sharp as new.