Premium QualityMade of premium chrome vanadium steel; Drill chuck capacity: 1.5-13mm (0.06-0.5 inch); Mount: 1/2-20UNF 1/4" Hex ShankThe hex shank chuck adapter can quickly connect to any impact driver and converts to drill function. PracticalThe jaws are specially treated to improve wear resistance; Versatile use on impact drills and electric screwdrivers. Excellent Clamping CapacityDesign Classic 3-jaw, securely holds a wide range of twist drills and step drills with 1/16" to 1/2" shank Please NoteChuck CANNOT be used counterclockwise! Must be transferred to ''impact drill stalls''! 1.5-13mm Capacity 1/2-20UNF Impact Drill Chuck with Hex Shank 1 /4" and Chuck Key High-quality stainless steel casting, wear-resistant and impact-resistant. The polishing surface is anti-oxidation , waterproof and anti-corrosion. Easy to assemble, can be used for electric drill, electric drill, etc. Fine workmanship ensures stable performance and long service life. Classic 3-jaw chuck, quick change and easy locking. The chuck is suitable for drilling machine tools and lathes and work related. Chuck Specification: Material: chrome-vanadium steel (CR-V) Hex Shank Diameter: 6.35mm (1/ 4 inch) Clamping Range: 1.5-13mm (1/16 - 1/2 inch) Mounting Thread: 1/2" (13mm) - 20UNF< /p> Please Note: The product CANNOT be used counterclockwise! Must be transferred in '' impact drill stalls'', when using the hammer chuck, other stalls will drive the broken chuck. Prevent trash from flying at work, please use safety glasses and gloves safety. The surface of this product may be scratched due to collisions during the transportation process, but it will not affect normal use, please rest assured to buy. Welcome to contact us if you have any problem, we would like to help you solve it. Package included: 1 x chuck 1 x chuck key 1 x 1/4" hex shank