☆ Material: The drill socket adapter is made from hardened and heat-treated chrome vanadium (Cr-V) steel to ensure long life through tough torque work without breaking or rusting. Robust construction compatible with the most powerful impact driver. ☆ SIZE: 1/4" 3/8" 1/2" impact driver bits and each with a set of 1/4" hex socket wrench adapters. Convert any power drill set into a nut socket set. Different color coded rings, make it easy to choose the right one. ☆ DESIGN: Spring-loaded ball lock ensures a tight fit in the rider’s head to prevent slipping during use. Specially machined double prong hex shank to fit securely in a hand screwdriver, drill or impact wrench. ☆ Multifunctional: The Extension Bit Holder is designed to provide a securely locked extension to your existing tool. Provides extra length to reach a multitude of hard to reach spaces. Attach these extension bars to any electric or cordless drill chuck or impact driver to turn it into a high-speed nut driver. ☆ USAGE: