BEYOURD metal O rings are made of heavy-duty 304 stainless steel and come in a range of inner diameters from 5/8 inch (15 mm) up to 6 inch (150 mm), with matching wire diameters to cover everything from small pet collars and bag straps to heavy hammock and tarp suspension. Each solid welded round ring is fully closed and gap-free, with a smoothed weld joint to help reduce sharp edges and burrs so it is safer to use with dog collars, leashes, belts, backpack straps, webbing and ropes. The polished O-shaped rings offer a smooth, durable finish that resists rust and corrosion in everyday indoor use as well as outdoor camping, hiking and marine environments. Across the different sizes you can choose rings for pet collars and harnesses, handbags and leather crafting, tie down and lashing straps, hammocks and hanging chairs, porch swings, plant hangers and other home décor or outdoor hanging projects