Latch, Padlock, Latch -Stainless Steel Seamless O Rings Round Circle Craft Boat Strap 6x40mm Highlights Brand Generic Stainless Steel Seamless O Rings Circle Craft Boat Strap 6x40mm Description: Seamless round o ring. Not to lift. 304 stainless steel materials Multiple sizes to choose from. High polished for a sleek appearance. Size Chart: 3 * 25mm / 0.12 * 0.98in (thickness * inner diameter) 4 * 30mm / 0.16 * 1.18in (thickness * inner diameter) 4 * 40mm / 0.16 * 1.57 inch (thickness * inner diameter) 5 * 30 mm / 0.2 * 1.18 inch (thickness * inner diameter) 5 * 40 mm / 0.2 * 1.57 inch (thickness * inner diameter) 5 * 50mm / 0.2 * 1.97in (thickness * inner diameter) 6 * 30mm / 0.24 * 1.18in (thickness * inner diameter) 6 * 40mm / 0.24 * 1.57in (thickness * inner diameter) 6 * 50mm / 0.24 * 1.97in (thickness * inner diameter) 8 * 40mm / 0.31 * 1.57in (thickness * inner diameter) 8 * 50mm / 0 ,31*1.97inch (thickness*inner diameter) 9*50mm/0.35*1.97inch (thickness*inner diameter) Package includes: 1 piece seamless stainless steel O-ring Note: Some error of measurement from 0.1 mm to 2 mm exists, especially from different batches.