【Premium 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 drilling function. 【Practical】The jaws are specially treated to improve wear resistance; Versatile use on impact drills and electric 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" shank 【Please Note】The chuck can NOT be used counterclockwise! Must be transferred to the ''impact drill stalls''! 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 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. Conventional 3-jaw