Get into tighter places more easily. Tough, aluminum oxide grit bonded to heavy-duty cloth backing. Mfg: Merit Abrasive Products, Inc. SPECS: 3⁄8" (9.5mm) base diameter, taper to ¼" (6.3mm) diameter at tip. 1" (2.5cm) long. Resin Bond. Packed 10 rolls of single grit per bag. Maximum speed: 18,000 rpm.