Milwaukee® diamond grinding wheels are designed to the highest standards, only using quality diamonds. Milwaukee® diamond grinding wheel is contains a flexible rubber backer, reducing vibration. This product can be used in concrete, mortar, steel, marble as well as glass and tile. Contains a 5/8-11 thread adapter for use on many grinders. Available in fine, medium and coarse grit. Features rubber backing reduces vibration. Designed to be used wet or dry. 5/8-11 thread for use with standard grinder. Coarse grit 56904.