320PCS Rivet Nut Kit,SAE & Metric Rivet Nuts Assortment Kit,Flat Head Blind Rivet Nuts Knurled,Threaded Inserts Rivet Nut Kit 7 Sizes(#8-32",#10-24",5/32-32",1/4"-20,3/8"-16,5/16"-18,1/2-13")