Detailed Product Description Combination wrench set for 21pcs:Use of chrome vanadium steel, 45 # carbon steel materials. After Duanda products, cold, heat treatment, polishing, grinding, electroplating process, and so on. For auto repair, home, construction and so there is a state of screws.Size ranges: 6mm to 27mm;Surface: Mirror polished with opening size stamped at both ends.G.W.: 21kgsQty/ ...