Material: The drill socket adapter made from heat treated hardened Chrome Vanadium (Cr-V) Steel to ensure a long lifetime through tough torque jobs without breaking or rusting heavy duty construction to be compatible with the most powerful impact driver. SIZE: 1/4 3/8 1/2 impact driver bits and each with a 1/4 inch hex shank driver socket wrench adapter set.Convert any power tools set drill bit set into a nuts socket set. Different colour coded rings, make it easier to pick the right one. DESIGN: The spring ball lock ensures a tight fit into the driver head to prevent slipping during use. Double tooth hex shank specifically machined to fit securely into a hand held driver, drill driver or impact wrench. Multifunctional: The extension bit holder is designed to provide a securely locked in extension to your existing tool. Provides additional length to reach into a multitude of hard to reach space. Attach these extender bars to any powered or cordless drill chuck or Impact driver to turn it into a high speed nut driver. USE: The impact socket adapter is a useful accessory for conversion. Useful for automotive mechanic vehicle repairs, technicians, handyman hobbyist developments to use with sockets on hardware tire nuts, lag bolts, hex head cap screws at home, workshop factory or construction site. Specification: Material: Chrome vanadium steel (CR-V) 1/4 inch Hex Shank to: 1/4 inch square drive / 6.35mm square head 3/8 inch square drive / 9.4mm square head 1/2 inch square drive / 12.6mm square head Packing Includes: 1 x (1/4 hex shank to 1/4 socket)Socket Adapter 1 x (1/4 hex shank to 3/8 socket)Socket Adapter 1 x (1/4 hex shank to 1/2 socket)Socket Adapter 1 x magnetic extension bit holder