M5 x 14mm Reduced Head Countersunk Rivet Nuts - 18-8 / 304 Stainless Steel: Accu.co.uk: Hardware
Amazon.com: Carbon Steel Reduce Head Rivet nut M3 M4 M5 M6 M8 M10 Blind Insert Nut Small head rivet nut countersunk head DUO ER (Color : White Zinc Plated, Size : M4 (
M6 x 14mm Knurled Countersunk Head Blind Rivet Nut Insert Nutsert 30PCS - Walmart.com
M8 x 1.25 Ribbed Rivet Nut, Countersink
Liberty Engineering NAS1329 and NAS1330 Rivnut® Fasteners