【Material】High-carbon steel, a high-quality material to be used with care. 【General Use】These extensions, adapters, and reducers are designed for impact use and feature spring-loaded locking balls to securely lock sockets, while the through holes at the drive end of the adapters and reducers lock onto the drive shaft for convenience, regardless of the tool you choose to use. Ideal for DIY projects, household maintenance, and most general repairs. 【High Quality】The extension adapters are made of heat-treated chrome vanadium steel with a black oxide coating. The adapters and reducers are made of premium, high-strength chrome steel with a manganese phosphate coating to help resist rust and corrosion. a long service life. 【Wide Application】 Suitable for 1/4" quick-change chuck systems or directly into the drill chuck. Any cordless electric drill can be used as a nut driver. Convenient for quickly driving nuts, bolts, and fasteners, etc. The spring-loaded ball bearing on the head securely