Get professional results in sandable materials with these miniature drum sanding bands. 12 mm abrasive band slips over the rubber drum; tightening the screw on the end of the drum expands the rubber to hold the sanding band securely in place. 3.2 mm shanks (approx. 1/8 inch) fit flexible shafts, drill press and rotary tools to smooth and shape materials with ease. Deluxe 102-piece set includes two 12 mm drum mandrels and 100 sanding bands, 25 each in 4 different grits: 60, 120, 240 and 400.