Century Drill And Tool 16 Piece Impact Pro Screwdriver Bit SetImpact Pro torsion bits are rated for maximum life in high torque drivers Designed to absorb the shock during Impact applications For use in Impact and other type drivers Set includes insert bits: (2 ea) #1, #2 Phillips, (1) #3 Phillips, (1 ea) #4 5, #6 8, #8 10, #10 12 Slotted, and (1) #2 Square. Power Bits: (1 ea) #1, #2, #3 Phillips, and #2, #3 Square. (1) magnetic bit holder