Patented bit holding system forces bit surface to opposing side for maximum bit retention, strength. Heat treated socket bases for durability and service ability. Chrome sockets, S2 and alloy steel bits. Includes 1/4" Drive, T10, T15, T20, T25, T27, T30,E4, E5, E6, E7, and E8, 3/8" Drive, T40, T45, T50, T55, E10, E12, E14, E16, 1/8"-3/8", 2, 2.5, 3-8, and 10mm Hex, and 1/2" Drive, E18 Bit Sockets. Comes complete in blow mold case36 Piece Master Torx with Hex Bit Socket Set includes 1/4", T10, T15, T20, T25, T27, T30,E4, E5, E6, E7, and E8, 3/8", T40, T45, T50, T55, E10, E12, E14, E16, 1/8"-3/8", 2, 2.5, 3-8, and 10mm Hex, and 1/2", E18 Bit Sockets packaged in a blow mold case.