MaterialSteel High carbon steel, high quality material avoid when using. General Purpose These extenders, adapters and reducers are designed for impact use and feature spring-loaded check balls to lock the sleeve securely, while the holes through the drive end of the adapter and reducer lock onto the drive rod. Whichever tool you choose to use, it is very useful. Ideal for DIY, home maintenance and most general repairs HIGH QUALITY The extension adapter is made of heat treated chrome vanadium steel with a black oxide coating. Adapters and reducers are made of premium high strength chrome steel with a manganese phosphate coating to help prevent rust and corrosion. Lifetime Use. Wide ApplicationSuitable for 1/4 inch quick change chuck system or direct insert chuck. Any cordless drill in a nut driver. Easy to quickly screw in nuts, bolts, fasteners, etc. Spring-loaded ball bearings in the head hold the sleeve securely. Feature: 1. Color coded for easy identification. 2. Spring-loaded balls provide a firm grip, so the socket snaps into place and won't slip. 3. 1/4" hex shank prevents stripping during high speed drilling operations. 4. Chrome vanadium steel heat treated for normal duty and impact use 5.Adapted drill and screwdriver socket to convert any electric or cordless drill into a nut driver. 6.Convert any electric drill into a quick-grip screwdriver. 7 Use manual screwdriver, battery or power tool. Material: Chrome vanadium steel (CR-V)