OverviewBall Bearing Design The Spring Loaded Ball Bearings On Each Square Head Are Securely And Locked Into Sockets To Avoid Slipping During Using Which Ensures A Tight Fit Into The Hand Held Driver Drill Driver Or Impact Wrench Package Included Four 1 4Inches Drives Two 3 8Inches Drives And Two 1 2Inches Drives. This 8Pieces Driver Extension Bar Set Can Be Converted To 1 4 3 8 1 2Inches Square Head To Meet Your Daily Needs Wide Application This 8Piece Hex Shank Bit Driver Extension Bar Set Is Designed To Meet A Variety Of Needs. Fits Snugly And Securely In Your Drill Chuck Or Hand Held Driver. Consisting Of Your Most Common Bit Sizes 1 4 In 3 8 In And 1 2 In Changing Shank Sizes. Provides Versatility And Convenience No Matter Which Tool You Chose To Use. Great For The Diy Household Maintenance And Most General Repairs Not For Industrial Work. A Great Tool Addition To Any Tool Box Set Universal Hex Shank This 1 4Inches Hex Shank Driver Dill Set Compatible With Most Of Screwdriver Handle Tools Power Drills Quickly Change 1 4Inches Chuck Systems Which To Change Your Drill Tools Into Power Nut Driver Premium Quality The Socket Adapters Are Made Of Rust Resistant Chrome Vanadium Steel And Black Oxide Coating With Bracket Torque Compression.These Suitable For Heavy Duty Impact Drivers For Long Lifetime Use