M3 M4 M5 M6 M8 M10 M12 Blind Hexagon Flat Head Rivet Nut Insert Rivnut

Size: M3 M4 M5 M6 M8 M10 M12. This item have 3 months warranty. Material: Carbon steel/Aluminum/ 304 stainless steel/ 316 stainless steel.

eBay