Century Drill And Tool 40 Piece S2 Screwdriving Bit SetThe screwdriving bits are made from premium S2 steel for long tool life Use for driving common or mild steel screws or case hardened screws Set includes Insert Bits: (3)#2 Drywall, #1, (6)#2, #3 Phillips, #1, #2, #3 Pozi, #6 10, #8 10, #10 12 Slotted, #1, (4)#2, #3 Square, T 10, T 15, T 20, T 25, T 27, T 30 Star Drive, 1 8, 5 32 and 3 16 Hex. Power Bits: (2)#2 Phillips, (2)#2 Square, #8 10 Slotted, and T 25 Star Drive plus a magnetic bit holder and