CRAFTMEMORE 4pcs O Ring Strong Metal Welded O-Ring Circle Loop Buckle is the perfect accessory for your purse, bag, collar, choker, and leather craft. Made of alloy metal with rust-preventive coating, these O-rings are high strength and resistant to corrosion. With an inside diameter of 1 inch (25 mm) and a thickness of 5 mm (3/16"), these O-rings come in a pack of 4 and are available in a brushed brass finish. Shop CRAFTMEMORE for a variety of leathercraft accessories and find the perfect O-ring buckle for your project.