Anti Corrosion Heat Resistant Retaining Rings at Best Price in Mumbai Amazon.com: large metal rings 45 Mm Large Round Ring Closed Ring Metal Jumbo Gump O Ring O Etsy Corrosion Resistant Drilling Ring Rock Drill Accessories HC95SA 101015592 Customized Anti wear Anti corrosion Erosion Tungsten Carbide Seal Ring Corrosion and Rust Resistance Cannon Ring for Laboratory Chemical. STERLING SILVER 925 Brushed Satin Finish Images show "Oxidized Silver" The "Corrosion" Ring represents the early stages when a material begins to see the effects of a chemical reaction, in this case oxidization. THIS ITEM IS HAND MADE TO ORDER IN NYC.?? PLEASE ALLOW 8 10 BUSINESS DAYS FOR PRODUCTION. ?? Sizing Not sure about your ring size? Measure the diameter of a ring you own. Size 4 14. 9mm Size 5 15. 7mm Size 6 16. 5mm Size 7 17. 3mm Size 8 18. 1mm Size 9 18. 9mm Size 10 19. 7mm Size 11 20. 5mm Size 12 21. 3mm Size 13 22. 1mm