Maxtech 16013MX Screwdriver Set, 32-Piece Drive bits made of S2 Steel for hand and power applications including longer 4 1/2" bits for heavy duty application 1/4": 6 x 4.5" D(SL4-5 - SL6-8, PH1-PH3, PH2 - SQ2, SQ1 - SQ3, T10-T15, T20-T25) S(SL8, SL10-12); 3 x N/S (1/4", 5/16", 3/8") 5/32"Micro Hex Shank Drive Bits:6 x 4.5"Double End Bits(PH000-SL1/16", P00-SL5/64", PH0-SL3/32", PH1-SL1/8", T6-T7, T8-T9) 3 Nut Drivers (3/32", 1/8", 5/32")