Suitable For 1/4" Quick-Change Chuck Systems Or Directly Into The Drill Chuck / Turns Any Electric / Cordless Drill Into A Power Nut Driver / Convenient For Quickly Driving Nuts, Bolts And Fasteners , Etc. Holds Sockets Securely. [Included] 3 Piece 1/4 3/8 / 1/2 Inch Extension Set And 4 Piece Socket Adapter 1/4 To 3/8 - 3/8 To 1/4 Inch - 3/8 To 1/2 - 1/2 To 3/8. Provides Versatility And Convenience No Matter What Tool You Have Chosen To Use.Great For Diy, Household Maintenance, And Most General Repairs, Not For Industrial Work.A Great Addition To Any Set Of Tool Boxes. Adapter Set 1/4 - 1/2 Inch 4 Pieces (Connecting Part) Fits For All Types Of Ratchets, Ratchets, Socket Wrenches, Torque Wrenches, Grips, Etc. Passivation Design: Both Ends Of Passivation Realize Rapid Install Ment, Also Easy To Disassemble.