The Wheeler Engineering Precision Micro Screwdriver Set features high quality, chrome plated steel bits to hold up to heavy use and the comprehensive 58 piece set meet all of your precision screwdriver needs. The set comes organized with individual bit markings and a convenient carry/storage case.All bits are precision formed for maximum fastener engagement. Nut drivers in mm - M2.5, M3, M3.5, M4, M4.5, M5Hex bits in mm - H.7, H.9, H1.3, H1.5, H2, H2.5, H3, H3.5, H4Square bits - SQ 0, SQ 1, SQ 2Flat bits in mm - 1, 1.3, 1.5, 2.0, 2.5, 3.0, 4.0Phillip bits - J000, J00, J1PH000 - PH00, PH0, PH1, PH2Triangle bits - 3.0, 2.3, 2.0Star bits - .8, 1.5, 2.0U bit - 2.6Torx bits - T3, T4, T5, T6, T7 T8, T9, T10, T15, T20Y bits - Yo, Y1Includes screwdriver handle adapter