【Material】Steel Carbon steel, high quality material avoid when using. 【General Use】 These extensions, adapters and reducers are designed for impact use and feature Spring-loaded detent balls to securely lock sockets in place while through-holes are at the end. Adapters and reducers snap onto the cleat. Convenience no matter which tool you choose. Ideal for DIY, household maintenance and most general repairs 【High Quality】The extension adapters are made from heat treated chrome vanadium steel with a black oxide coating. Adapters and reducers are made of high quality, high strength chrome steel with a manganese phosphate coating to resist rust and corrosion. lifetime use. 【Widely Used】Suitable for 1/4 quick change chuck systems or directly into the drill chuck. Each cordless drill in a socket wrench. Convenient for quickly driving in nuts, bolts and fasteners.