Features: This chuck is easy to use and install, allowing for quick and easy tool changes. 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 with diameter from 0.3mm to 3mm. Keyless design, easy to hold or release tool bits in a short time. Specifications: Material: Aluminum alloy Color: Black. Hex Shank: 6.35mm (1/4") Capacity: 0.3mm~3mm Package Includes: 1 x Chuck An Ideal Accessory: Transforms any ¼ cordless screwdriver into a drill or grinder to quickly change tasks and keep the job moving. Easy to put on and take off: Keyless chuck converter to go from driving to drilling in seconds, greater clamping force, effectively preventing drill bits from coming loose, more reliable. Easy to use and install: Keyless design, instantly converts impact driver to hold non-quick change drill bits and driver bits. One-handed drilling: gives you the freedom to drill with one hand and is perfect if you are working in tight spaces Universal driver: 1/4 Hex shank is suitable for most power tools such as electric drill, grinder, electric screwdriver, large capacity, it can be used for bits of diameter from 0.3mm to 8mm. Easy to Use and install: Keyless design, instantly converts impact driver to hold non-quick change drill bits and driver bits.