Atoplee 14pcs 1/4 inch Hex Shank Drill Screwdriver Bits Socket Adapter Extension Material: chrome vanadium steel;Shank shape: Hex shank Shank length: 2.2mm; Shank diameter: 1/4 inch(6.35mm) The product is made from high quality material, easy to be installed and dismantled, not easy falling off when it was using. Anti rust, anti slip, high occlusion, tight and flexible. It is applicable for installing in those hexagon tools, such as pneumatic screwdriver, electric screwdriver, pneumatic drill, electric drill, pistol drill, manual screwdriver, etc.