Socket flat head screw for 3D Printer Specification: M5*12 Material: SUS304 or Carbon Steel Packing: SUS304 M5*8, M5*10, M5*12 20 pieces per lot. Black carbon steel M5*12 50 pieces per lot. M2, M3, M4, M5 socket flat head screw, Nut and Washer are available.