(500) Vite da Taglio Filettatura Rondella Esagonale 6-32X1/2 Slot Tipo-F Acciaio Duro AutoTappi
Because these screws possess almost twice the strength of ordinary machine screws much smaller screws can be used. When driven into untapped holes (drilled or punched) they stay snug in their self-cut, perfectly mated threads.