Hardened and tempered chrome vanadium steel. Auto repair tools for removal or replacement of oil drain plugs. Contains hexagonal and square-shaped keys. Includes carbon steel sliding T-bar; hex: 3/8", 8, 9, 10, 12, 14 and 17mm sockets; square: 3/8", 8, 11 and 13mm sockets; and tough storage case. Weight: 1.13kg.