20pcs 3/32" 4mm Bullet RUBBER Rotary Tool Polishing Burr with 3/32 inch Shank for Dremel and compatible Rotary Tools 20 pieces of RUBBER polishing burrs for all your polishing needs. The heads are in bullet shape with diameter of 4 mm. All 3/32" shank. | Fits rotary and jewerly tools that accept 3/32" shank size. US-BASED CUSTOMER SERVICE: Available by chat, email, phone, or visit us at our customer service center in La Crosse, WI.