【Premium Quality】Made of premium chrome vanadium steel; Drill chuck capacity: 1.5-13mm (0.06-0.5 inch); Fitment: 1/2-20UNF 【1/4 \" Hex Shank】The hex shank chuck adapter can be quickly connected to any impact wrench and converted to drilling function. 【Practical】The jaws are specially treated to improve wear resistance; Versatile use on impact drills and screwdrivers. 【Excellent Clamping Capacity】Classic 3-jaw design, securely holds a wide range of twist drills and step drills with 1/16 \" to 1/2 \" shanks 【Please Note】The chuck CANNOT be used counter-clockwise! Must be transferred to ''impact drill mode''! 1.5-13mm Capacity 1/2-20UNF Impact Drill Chuck with 1/4 \" Hex Shank and Key Chuck Cast from high-quality stainless steel, wear-resistant and impact-resistant. The polishing surface is anti-oxidant, 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 related work. 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 Please Note: The product CANNOT be used counter-clockwise! Must be transferred to ''impact drill mode'', when using the hammer chuck, other modes will cause the chuck to break. Prevent scrap from flying at work, wear safety glasses and gloves. The surface of this product may be scratched due to collisions in the transportation process, but it does not affect normal use, please rest assured to buy. Welcome to contact us if you have any problems, we are happy to help you solve it. Package Includes: 1 x Chuck 1 x Key 1 x 1/4 \" hex shank chuck