【Material】Steel 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 detent balls to lock the sleeve securely, while the holes through the drive end of the adapter and reducer lock onto the driver rod. Whichever tool you choose to use, it’s very handy. 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 premium high strength chrome plated steel with a manganese phosphate coating to help prevent rust and corrosion. Lifetime Use. 【Wide Application】Suitable 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.