Bulk Packaged 13/16 inch 400 Grit Diamond Disk, 1/16 inch hole. 0.010 inch thick. Use with 1/16 inch Screw Mandrel which is not included. For use with Dremel Rotary Tools. Diamond disks can be used to some extent for cutting. However, there is a limited amount of diamond coating on the edge, most of the coating is on the side. For longer life, use with a cooling agent such as Eurotool Cut Lube.