All bits are made by high quality S2 steel material. Suitable for industrial use.        
Pack of 32 bits includes Slotted bits (SL3, SL4, SL5, SL6); Phillips bits (PH0, PH1 ×2, PH2 ×2, PH3); Pozi bits (PZ0, PZ1, PZ2, PZ3); Torx bits (T8, T10, T15, T20, T25, T27, T30, T40); Hex bits (HX1.5-50, HX2.0-50, HX2.5-50, HX3.0-50, HX4.0-50, HX5.0-50, HX5.5-50, HX6.0-50).        
1 extension bit holder for secure fastening, quick bit changes, and compatibility with most power tools and hand drivers.        
Wide range of household uses for cabinet, door and bed installation/repairing electronic product/tighten or loosen the screws on the bicycle, door, window frame etc.        
Can be used with electric screwdrivers, hand screwdrivers. Ideal for cars, trucks, machinery and home repair use.