Emery-impregnated disc gives you the power to polish most ferrous metals, as well as stones, glass and ceramics. It can be used to remove small burrs and scratch marks left by grinding and sanding, and can also help you clean and define grooves. 1 In. (inch) diameter wheel. 1 In. tip is perfect for small projects. Easily cleans and polishes coarse surfaces. 1/8 In. (inch) thick. Use with 1/8 In. shank mandrel. Compatible with most Dremel rotary tools.