The Little Rivet Nut Is Better Than The Self-Tapping Screw
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XXR FLAT BLACK RIVET NUT AND BOLT KIT FITS XXR 521 969 (80 nuts & 80 bolts) | eBay
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Blind rivet bolt - 6540 series - FAR - cylindrical head / steel
10/20pcs Aluminum Flat Head Metric Thread Blind Blinding Rivet Nut Insert Rivnut Nutsert For M3 M4 M5 M6 M8 Bolt Screw C - Nuts - AliExpress