D Ring Inner Width Forged Steel Js Custom 45mm Fall Protection Equipment/Harness Accessories/Safety Belt Accessories Js-3006 92g - China D Ring, D Rings Hardware | Made-in-China.com
New OM SYSTEM OLYMPUS DR-40 Decoration Ring for Zuiko Digital 45mm 1.8 | eBay
Stainless Steel 316 Round Ring Welded 1/4" x 1 3/4" (6mm x 45mm) Marine Grade - US Stainless