CNBTR 35x19mm Stainless Steel M8 Snap Quick Hook Link Chain Fastener Carabiner with Threaded Nut Pack of 5 Great for pet chain, wire rope, climbing rope to do a quick fastening, pet chain DIY accessories Made of 304 stainless steel,high quality Quick Link Chain Fastener Carabiner With M3.535x19 size,strong and durable.