Description:Marine grade 304 stainless steel - superior strength and rust resistanceHigh precision polished for sleek appearance.Non-rusting stainless steel ring - versatile strap, binding and rigging hardwarePerfect for marine, diving and outdoor harsh-condition applications; luggage & bags, saddles; hammock yoga ringRings are sized by ring thickness by inside diameterSpecification:Thickness x Inner Diameter5 x 25 mm/ 0.2 x 1 inch5 x 35 mm/ 0.2 x 1.4 inch5 x 45 mm/ 0.2 x 1.8 inch6 x 25 mm/ 0.24 x 1 inch6 x 35 mm/ 0.24 x 1.4 inch6 x 45 mm/ 0.24 x 1.8 inch6 x 60 mm/ 0.24 x 2.4 inchPackage Includes:2 Pieces Stainless Steel O Ring(2 Pack)Note:0.1mm-2mm measurement error exists, especially from different batches.