Features:This chuck is easy to use and install, allowing quick and easy power tool bit change.Made of high quality aluminum alloy, this chuck is durable and rust-resistant.1/4 hex shank is suitable for most power tools such as electric drill, grinder, screwdriver.Large capacity, it can be used for bits of diameter from 0.8mm to 8mm.Keyless design, convenient to hold or release bit in a short time.Specifications:Material: Aluminum alloyColor: BlackHex Shank: 1/4in (6.35mm)Capacity: 0.8mm~8mmPackage Includes:1 x Chuck