You will get more done with a Century Drill & Tool Security Star-Drive Bit Set on hand. Amazing in value, this screwdriver bit set comes with T8, T10, T15, T20, T25, T27, & T30 insert bits and a T40 magnetic bit holder so you always have a tool for the job. The bits are versatile too, able to fit multiple tip hand drivers and 1/4-in. hex holders for power driving applications. The 9 pc. bit set features premium S2 steel construction for long life while driving common or mild steel screws or case hardened screws.