These nuts are what they are. Hexagon nuts M3x0.5mm stainless steel. They connect effortlessly with 3mm screws spaced 0.5mm apart and have a snug fit with no play. Anything could be asked at the clasp.
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)
10 Review
Get A Strong Grip With TICONN'S 100 Pc SAE Rivet Nut Kit - Zinc Plated Carbon Steel Flat Head Insert Nut With Knurled Body (SAE UNC 8-32)
6 Review
304 Stainless Steel Machine Screw And Hex Nut Assortment Kit - 170 Pieces By T.K.Excellent
4 Review
Pack Of 50 Stainless Steel 5/16-Inch Standard (SAE) Nylon Insert Lock Nuts By Fullerkreg
5 Review