Tip: # 4 PhillipsOverall Length: 1-1/8"Shank: 5/16" HexFor Use With Hand Drivers And/Or Power ToolsDesigned To Withstand The High Torque Of Impact DriversCan Be Used To Install Or Remove ScrewsFully Hardened And Tempered For Long Life Under Constant UseMay Need A 1/4" Shank Adapter For Use In Some Power Tools