Hardware is on this page is meant for DIYers and home-sewing projects - this item is not meant to be added to a collar in your order. Contact us for upgrades and add-ons for custom products. 2 inch Standard Weight rectangle ring Wire thickness: 4mm Inside measurements: 2.00 inches wide and 0.50 inches tall Outside measurements: 2.32 inches wide and 0.81 inches tall Welded, nickel plated over steel rectangle ring 1-1/2 inch HEAVY WEIGHT rectangle ring Wire thickness of 5mm Inside measures 1.528 inches wide and 0.413 inches tall Outside measures 1.923 inches wide and 0.809 inches tall 1-1/2 inch LIGHTWEIGHT rectangle ring Wire thickness of 3mm Inside measures 1.507 inches wide and .417 inches tall Outside measures 1.748 inches wide and .66 inches tall 1 inch Standard / Heavy Weight rectangle ring Wire thickness of 4.5mm Inside measures 1.01 inches wide and 0.405 inches tall Outside measures 1.367 inches wide and 0.753 inches tall 1 inch LIGHTWEIGHT rectangle ring Wire thickness of 3mm Inside measures 1.07 inches wide and .405 inches tall Outside measures 1.308 inches wide and .645 inches tall 3/4 inch rectangle ring Wire thickness of 4mm Inside measures .782 inches wide and 0.398 inches tall Outside measures 1.098 inches wide and 0.714 inches tall 5/8 inch rectangle ring Wire thickness of 2.5mm Inside measures .638 inches wide and 0.262 inches tall Outside measure .835 inches wide and 0.463 inches tall 3/8 inch rectangle ring Wire thickness: 2 mm Inside measurements: 0.395 inches wide and 0.18 inches tall Outside measurements: 0.55 inches wide and 0.34 inches tall Sold individually. Keep in mind you'll need TWO for a martingale collar. Welded, nickel plated over steel rectangle ring We specialize in small-to-medium quantity purchases. We have moderate quantities in stock at any given time. If you need more than 200 of one size, please message us for a custom order with bulk pricing, more precisely calculated shipping. and an accurate processing time.