CarBole 3 Sizes Socket Adapter Set Hex Shank to 1/4",3/8",1/2" Impact Driver Drill BIts 1. Brand: CarBole ; Driver sizes (inches): 1/4, 3/8,1/2 . 2. Chrome vanadium steel; Heat-treated steel ; Ball-bearing lock . 3. Applies to the screwdriver handle or electric screwdriver tools . 4. Suitable for Quick Change 1/4" Chuck Systems or Directly into Drill Chuck; Change Your Hand Socket Set Into A Driven Socket Set. 5. Adapter Set that includes DW2541IR (1/4" hex shank to 1/4" socket), DW2542IR (1/4" hex shank to 3/8" socket), and DW2547IR (1/4" hex shank to 1/2" socket) adapter .