Standard 1/4 inch hex drive screwdriver bits. Made of chrome vanadium steel. Set includes: 3, 4, 4.5, 5, 5,5, 6, 6.5, 7, and 8mm slotted bits; No 0, No 1, five No 2, and No 3 phillips bits; No 0, No 1, five No 2, and No 3 security phillips bits; No 0, No 1, No 2, and No 3 square drive bits; 1.5, 2, 2.5, 3, 4, 5, 5.5, 6, and 8mm hex bits; 2, 2.5, 3, 4, 5, and 6mm security hex bits; 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, and 1/4 inch hex bits; 5/64, 3/32, 7/64, 1/8, 9/64, and 5/32 inch security hex bits; 4, 6, 8, and 10mm spanner bits; No 6, No 8, and No 10 posidrive bits; T8, T10, T15, T20, T25, T27, T30, T40, and T45 star bits; T8, T10, T15, T20, T25, T27, T30, T40, and T45 tamper resistant star bits; No 1, No 2, No 3, and No 4 tri-wing bits; No 1, No 2, and No 3 clutch drive bits; M5, M6, and M8 Spline Bits; Five Drive accessories; all in a plastic storage case.