Solid Brass Phillips Machine Screws Countersunk Flat Head Bolts M2 M3 M4 M5 M6
M2 M2.5 M3 M4 M5 M6 Hex Socket Head Screws Nuts Bolts & Washers Assortment Kit
When installing, you can use tweezers to pick up the screws, put them into the firmware that needs to be linked, then use the built-in hexagonal wrench to tighten, and then Install nuts and flat washers to prevent loosening.