【Purpose】: This adapter set is designed to provide your existing tool with a lockable extension. It provides additional length to reach a variety of hard-to-reach places. The spring-loaded ball lock ensures a tight fit in the screwdriver head to prevent slipping during use. Specially machined to securely fit a manual screwdriver, drill driver, or impact driver. 【PACKAGE INCLUDES】: 3 pieces: 1/4", 3/8", 1/2", each with 1/4" Allen key/screwdriver bits for all quick-change drill chuck systems. Converts any drill into an electric socket. A robust, spring-loaded ball bearing holds the sockets securely in place. The sockets lock firmly into place and won't slip. 【Colorful】: Easy selection: Various color-coded rings provide clear guidance for quickly selecting the right socket. Our products are state-of-the-art and of excellent quality. 【Material】: Chrome vanadium. QUALITY: Made of hardened chrome vanadium steel (Cr-V) to ensure a long service life. The design should be compatible with the