0.3-3.2MM Faster Bit Swaps Multi Chuck Keyless for Rotary Tools. * Made of ABS Plastic. * Capacity: 0.3 to 3.2mm. * Gripping range is 0.4-3.2mm. * Suitable for general electric grinders, pneumatic machines. * M8 Plastic Keyless Drill Bit Chuck for Electric Grinder. * It can be used directly on the output shaft of the small flexible shaft. * Package includes: 1 pc of keyless drill bit chuck. * Heat treated & tempered high-carbon steel for durability; rust-resistant black oxide finish. Twist-to-tighten/loosen with heavily-knurled grip means no wrench or key needed.