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Amazon.com: 6 Inch Metal Ring
Amazon.com: 6 Inch Ring
Welded Rings - McMaster-Carr
Steel - Circles, Rings, Base Plates, Gussets - Metals Depot
Stainless Steel Retaining Rings - McMaster-Carr
Stainless Steel Split Rings - McMaster-Carr
Retaining Rings & Snap Rings - Smalley
Stainless Steel Round Rings - BOSUN SUPPLIES
Amazon.com: Welded Steel Rings
Rings, Flanges, Hoops, Straps, Saddles, Circles & Tracks