Contains:14 pcs. of power sockets 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24 mm.KraftTecos® power sockets are made of chrome-vanadium-mobyden steel. The quality standard corresponds to the norms of GGG-W660A and DIN 3121/3129 in terms of hardness, function and torque.