M2 M2.5 M3 M4 M5 Titanium Plated Gold Round Countersunk Hex Socket Head Screws
Thread size: M2 (Thread division 0.4mm) / M2.5 (Thread division 4.5mm) / M3 (Thread division 0.5mm) / M4 (Thread division 0.7mm) / M5 (Thread division 0.8mm). – Head shape: Lens head with hexagon socket.