The metal hooks, otherwise called, metal hooks, steel hooks, hog rings, c rings or clips, are staples (Staples), which, using a anellatrice, otherwise call, forceps, agganciatrice, stapler, or welder, used to bind and to tighten, two or more articles, generally of the form thread-like, such as, metal wires, wire ropes, ropes, cables, nets, cages, gabions, springs, etc.
Such hooks, once closed, can be shaped, round, oval or triangular.
The most common materials are steel, galvanized steel, zinc-aluminum, stainless steel, aluminum and also for special requests, colored.
The resistance to opening of the hooks is determined primarily by the material, the tensile strength, the diameter of the wire of the clip and from the greater or lesser closure of the hook itself.
The closure of the hooks, which is the most peculiarities of the same, ranging from 2-3 mm of inner diameter of the ring closed to 17 mm for the hooks larger.