M5X0.8X5.00 Metric Flat Head Round Open-End Rivet Nut Steel Zinc Yellow Dichromate (Pack Qty 2,000) BC-XS-M55.00Y

One popular use is as a leg leveler. Large flange provides a greater bearing surface that increases push-out strengthYou may also like 6-32 X 1/8 MS51957, Phil Pan Machine Screw Coarse Full Thread 300 Series S/S DFAR (Pack Qty 2,000) BC-MS51957-24.