Packaged 100pc 1 1/12" (27.52mm) inch Fiberglass Reinforced Cutoff Wheels Each disc is fiberglass reinforced for strength and longer life than normal cutoff discs. middle holes is 2mm; Thicknesses 0.05"; Compatible for Dremel Rotary Tools. 2 compatible 1/8" (3.175mm) mandrel included Compatible for Dremel Rotary Tools. Max speed 15,000 rpm. | A sampling showed thicknesses ranging from about 0.048 to 0.065 inches US-BASED CUSTOMER SERVICE: Available by chat, email, phone, or visit us at our customer service center in La Crosse, WI.