330Pc M2 M3 M4 M5 Brass Threaded Knurled Insert Embedment Nuts various sizes Kit

30 M2 4 3.5. 30 M2 6 3.5. 30 M2 8 3.5. 20 M2 10 3.5. 15 M5 6 7. 10 M5 8 7. 10 M5 10 7. Made from brass, which is corrosion resistant, rust-proof, and has thermal and electrical conductivity.

eBay