Metric Rivet seem to be good quality part and comes with all the size you commonly need.
I am a weekend warrior and it fits all my need.
LOKMAN 105PC Rivet Nut Assortment Kit With Flat Head Carbon Steel Threaded Inserts - Includes 8-32UNC, 10-24UNC, 1/4"-20UNC, 5/16"-18UNC, And 3/8"-16UNC Knurled Body Rivnuts (Rivet Nut Kit 2)
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