The set includes 100 pc 414 Felt Polishing 1/2" (12.7mm) Diameter x 1/4" (6.35mm) Thick Wheels with 2 pc 1/8" (3.175mm) shank screw mandrel 401. Rotary tool accessories, felt-tipped, made of top quality wool, Compatible for Dremel. Smooth and refine surfaces by using these felt buffs to polish or grind metal, ceramics and glass. Ideal for smoothing interior surfaces. | All with 1/8" (3.175mm) Mandrel US-BASED CUSTOMER SERVICE: Available by chat, email, phone, or visit us at our customer service center in La Crosse, WI.