Purpose: This adapter set is designed to provide a locked extension to your existing tool. Provides extra length to reach a multitude of hard to reach spaces. The spring ball lock ensures a tight fit in the driver's head to prevent slipping during use. Specifically machined to securely fit a handheld screwdriver, drill driver or impact wrench. PACKAGE CONTAINS: 3Pcs: 1/4", 3/8 ", 1/2" each with 1/4" hex wrench/driver bits for all quick change drill chuck systems. Turns any electric drill into a conductive power nut Heavy duty spring loaded ball bearing maintains sockets securely in place. Sockets snap firmly and won't slip. Colorful: Easy to choose: Different color-coded rings, clear help quickly choose the right one. Our products belong to the latest updates, the quality is super good. Material: chrome vanadium QUALITY: Manufactured from hardened chrome-vanadium (Cr-V) steel to ensure long life Construction to be compatible with most powerful impact guns. Usage: Installs comfortably and securely in your drill chuck or handheld driver. Comprised of your most common bit sizes 1/4", 3/8", and 1/3" change shank sizes Provides versatility and convenience no matter which tool you have chosen to use. Great for DYI, auto repairs, household maintenance, and most general repairs. A good addition to any set of tool boxes.