Bosch CC90396 Insert Bit Set, Steel, 6-Piece

Fully hardened and tempered for long bit life under constant heavy-duty use. The tip is precision formed for proper use. Use when driving heat-treated or case-hardened screws such as sheet metal, self-tapping or self-drilling. Made of the highest quality S2 tool steel for durability. A proven sub-zero tempering process gives these bits extended life. Shank diameter 1/4 in, Shank 1/4 in. Bit set includes a T10, T15, T20, T25, T30 and T40.