Chrome vanadium alloy steel for strength and long life; Triple chrome plating and ultra smooth high polish finish for added life; Meets and exceeds US federal standards for strength and performance; The Evercraft socket set is a complete collection of most frequently used sockets and accessories. Contents: (25) Sockets,3/8 in. Drive,3 in. Extension,3/8 in. Ratchet,5/8 & 13/16 in. Spark Plug Socket,3/8 in. Drive Female x 1/4 in. Male Adapter, Socket Size: 1/4 in, 9/32 in, 5/16 in, 11/32 in, 3/8 in, 7/16 in, 1/2 in, 9/16 in, 5/8 in, 11/16 in, 3/4 in, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm