Wheeler Gunsmithing Screwdriver Kit (72-Piece) 54 hallow ground flat bits made of durable S2 tool steel and designed to match the thin slots in gun screws Comes with 4 Phillips Bits 8 Allen Bits (1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16) 3 Torx Bits (T10, T15, T20) Two non-slip over-molded handles and convenient hinged storage case