Dremel 20-Pk. 15/16" Heavy Duty Emery Cutoff Wheel is used for slicing and cutting applications. With a speed rating of 30,000 rpm, it is suitable for use with rotary tools and hand grinders. Made of emery, this cutoff wheel is 0.04" thick and is used with mandrel model #402, Montvale Hardware & Paint Supply #334508. This 15/16 inch diameter cut-off wheel is made of a hard abrasive material that's used for slicing and cutting metal, including hardened steel. It makes it easy to cut bolts or screws or make slots in rusted or stripped bolts and screws to allow for easy removal with a screwdriver.