This alloy steel tap and die set helps you overcome damaged nuts, bolts and threads. When a replacement bolt is hard to find, this tap and die set makes it easy to remove imperfections from threads This tap and die set includes a wide assortment of tools, they are made from hardened, precision-ground, polished alloy steel, each piece under a rust-resistant satin finish that makes smooth thread cuts with less friction. The set is of metric size.