M4X0.7X2.00 Metric Flat Head Round Open-End Rivet Nut Steel Zinc Yellow Dichromate (Pack Qty 2,000) BC-XS-M42.00Y

Metric Flat Head Round Open-End Rivet Nut Steel Zinc Yellow Dichromate

One popular use is as a leg leveler. Large flange provides a greater bearing surface that increases push-out strength