10pc Screw Bit Mandrel 1/8” inch Shank Felt Polishing Tip Holder. Capable of holding various polishing tips including wheel and cone shapes. 1/8" (3.175mm) shank size. Compatible for Dremel and other Rotary Tools. A shank with screw like head. | Shiny and durable. US-BASED CUSTOMER SERVICE: Available by chat, email, phone, or visit us at our customer service center in La Crosse, WI.