【Superior Quality】Made of premium chrome vanadium steel; Drill chuck capacity: 1.5-13mm (0.06-0.5 inch); Mount: 1/2-20UNF 【1/4" Hex Shank】The hex shank chuck adapter can quickly connect to any impact driver and converts to a drill function. 【Convenient】The jaws are specially treated to improve wear resistance; versatile use on impact drivers and electric screwdrivers. 【Excellent Clamping Capacity】Classic 3-jaw design securely holds a wide range of twist drills and step drills with a shank from 1/16" to 1/2" 【Please Note】The chuck cannot be used counterclockwise! Must be transferred to impact driver chucks! 1.5-13mm Capacity 1/2-20UNF Impact Drill Chuck with 1/4" Hex Shank and Chuck Key High-quality stainless steel casting, wear-resistant and impact-resistant. The polished surface is anti-oxidation, waterproof, and corrosion-resistant. Easy to assemble, can be used for electric drills, power drills, etc. The fine workmanship ensures stable performance and a long service life. Classic