M6 x 16mm Blind Rivet Nut - Steel Zinc Plated - Cylindrical Head

Type: cylindrical threaded. Particularly suitable for fastening thin materials, these can be used as a captive nut or rivet and are ideal for fastening materials with a lower grip range (under 3mm). The Rivet Nuts have been designed for applications where the use of a tapped thread is impractical or impossible.

eBay