This CRL 3M® Roloc™ Disc is used with the CRL 3M® Roloc™ System or by itself using a mandrel coupled with your drill or Dremel® Tool. This diamond disc works well for the grinding and shaping of glass objects, internal cutouts, and a variety of other applications. Use a spray bottle with coolant to prolong the life of the disc. The mandrel has 1/4" (6.4 mm) straight shank to fit all drills.