M6X1.0X5.00 Metric Flat Head Rivet Nut Aluminum Cleaned and Polished NON-RIBBED (Pack Qty 2,000) BC-XA-M65.00

One popular use is as a leg leveler Aluminum: 6053 or 5056 Aluminum alloyYou may also like 1/4X3/4 Countersunk Drive Aluminum Rivet (Pack Qty 1,000) BC-14750ACA.