Fangrui Product Details The Drill Socket Adapter Made From Heat Treated Hardened Chrome Vanadium (cr-v) Steel To Ensure A Long Lifetime Through Tough Torque Jobs Without Breaking Or Rusting Heavy Duty Construction To Be Compatible With The Most Powerful Impact Driver. Size: 1/4 Inch 3/8 Inch 1/2 Inch Impact Driver Bits And Each With A 1/4 Inch Hex Shank Driver Socket Wrench Adapter Set.convert Any Power Tools Set Drill Bit Set Into A Nuts Socket Set. Design: The Spring Ball Lock Ensures A Tight Fit Into The Driver Head To Prevent Slipping During Use. Double Tooth Hex Shank Specifically Machined To Fit Securely Into A Hand Held Driver, Drill Driver Or Impact Wrench. Multifunctional: The Extension Bit Holder Is Designed To Provide A Securely Locked In Extension To Your Existing Tool. Provides Additional Length To Reach Into A Multitude Of Hard To Reach Space. Attach These Extender Bars To Any Powered Or Cordless Drill Chuck Or Impact Driver To Turn It Into A High Speed Nut Driver. Use: The Impact Socket Adapter Is A Useful Access