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Steel Pop Rivet Washers #8 (1/4") Diameter Blind Rivet Back Up/Backing Washers (100): Amazon.com: Industrial & Scientific
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Amazon.com: Metal Magery Aluminum Backup POP Rivet Washers for 1/8" Diameter Rivets, Pack of 250 : Industrial & Scientific
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Persberg 300pcs Rivet Back-Up Washers Kit-Stainless Steel Assortment for 1/8", 5/32", 3/16" Rivets (M3, M4, M5)-Rust-Proof, Enhanced Grip, Durable Reinforcement for DIY Projects, (120-28): Amazon.com: Industrial & Scientific
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