Universal Use - The Extra-Hard Screwdriver Bit and Nutsetter Set, 43-Piece is a good choice for universal use. S2 Modified Steel and an optimised heat treatment process provide the bits with an extra-hard quality, delivering a strong performance in all tasks. The bits feature a tapered torsion zone that easily handles torque peaks by absorbing the force and vibrations when screw-driving in all materials. Furthermore, the bits are colour-coded for quick overview and recognition of the appropriate bit type. It has a 1/4-inch external hex shank and is intended for universal screw-driving with screwdrivers and drill drivers. The Extra Hard Screwdriver Bit and Nutsetter Set, 43-Piece comes in a practical and robust storage box providing a good view of its contents as well as safe storage and transport. This set contains: PH1, PH2 (2x), PH3 PZ1, PZ2 (2x) PZ3 SL3, SL4, SL5, SL6 H3, H4, H5, H6 T10, T15, T20 (2x), T25, T27, T30, T40 TH10, TH15, TH20 (2x), TH25, TH27, TH30, TH40 PH2 PZ2 SL6 T15,