Not only can you use the torx bits on hand tools, you can easily insert them to any 1/4 inch hex shank power drill to use. One set is enough for furniture installation, car maintenance, electronic factory, office installation, kitchen installation, etc. Complete rust and corrosion resistance with the active Manganese Phosphate treatment for enhanced durability under any circumstances. Strong magnetic and high precision. each edge can be accurately locked screws, no damage to the screw and the screwdriver head. Drill bits made from high quality S2 steel material with sturdy hardened & tempered construction, suitable for industrial use. Tamper Proof Security Bits in the Following Sizes:12 Pack 1" star bits T5, T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, and T40 (T5 and T6 are not tamper proof security bits) and 12 pack 2.3" star bits T5, T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, and T40 (T5 and T6 are not tamper proof security type).