Silicon Polishing Cone - 1200 Grit (Pink) Premium silicon-carbide wheels formulated to provide the smoothest finish without the use of messy polishing compounds. Cone is mounted on 3/32" shank. This cone is 5/8" x 7/32" and is grit 1200 (ultra fine). Ultra fine, soft and flexible for a super high lustre; final finish, medium lustre or smooth matte finish. Operating speed range is 5000 to 10,000 rpm. Supplied as a package of a dozen.