Preamer 0.3-3.2mm Keyless Chuck Universal Electric Grinder Chuck For Dremel This universal chuck allows you to quickly and easily change accessories on your Dremel tools without using collets. It accepts accessories from 0,5mm(1/32") to 3.2mm(1/8") shank. Twist-to-tighten/loosen with heavily-knurled grip means no wrench or key needed Fits Dremel and other-brand rotary tools with spindle thread M8*0.75mm Made of aluminium alloy(chuck housing) and powder metallurgy(chuck claw) for durability,rust-resistant black oxide finish Clamping range: 0.3-3.2mm Chuck allows quick and easy accessory changes without changing collets