Fast-cutting, 1200 grit, silicon carbide abrasive is uniformly dispersed throughout a rose colored silicone rubber bond for smooth finishing of precious metals. Can be easily dressed on a file to a fine point for accessing recessed and detailed areas. These 7/8" diameter, knife edge wheels have a 1/16" arbor hole. Maximum operating speed: 10,000rpm. Can be used on our Screw Mandrels.  1200 grit is recommended for creating a bright high shine. Made in Romania. Sold in a package of 100.