12-Piece pass-through sockets: 10, 11, 12, 13, 14, 15, 16, 17, 19, 21, 22 and 24 mm.One pass-through ratchet, 72 teeth/5° action, with flexible head.One pass-through extension bar, 75 mm.Matte finish.High-performance alloy steel.Case: High density polythene (HDPE).Standards: ISO 1174 and DIN 3120