Split Key Rings: Heavy Duty 1.8MM Steel, Nickel Plate 1" ID 100 Pieces Bulk This lot: 100 Pcs 1" (inside diameter) Heavy Duty Nickel Finish Key Rings as shown. Super-strong, double-wound 1.8 mm gauge flattened steel; each weighs just over 1/10 ounce. Bright nickel finish.