IRWIN Tools 34-Piece Fastener Drive Tool Bit Set (3057034) IRWIN bits are manufactured from industrial-grade tool steel Bit set is tested to meet the highest standards for hardness and torque 2" socket adapters: 1/4", 3/8" and 1/2" 2" power bits: #1 Phillips, #2 Phillips, #3 Phillips, #1 POZIDRIV, #2 POZIDRIV, #3 POZIDRIV, T8 TORX, T9 TORX and T10 TORX 3-1/2" power bits: #1 Phillips, #2 Phillips, #3 Phillips, #2 POZIDRIV, T15 TORX, T20 TORX, T25 TORX and T30 TORX