Eureka Self Tapper Pan Head Galvanised 20-Piece Set, 3.9mm Size

Self-tapping point cuts its own thread as it drives into sheet metal Goes straight into thin steel and plastic without a pre-drilled pilot hole Fastening sheet metal and plastic; the thread cuts its own mating thread as it drives Wood / Timber Can be used as a permanent and non-permanent fastening solution.Includes a Combi Drive head that can be installed with a flat or pozi bit/screwdriver.Used when you don't have access from the rear to install a bolt and nut.Used instead of blind rivets.For the pilot hole: Use a drill bit 1mm thinner than the thickness of the screw when installed to metal that is thinner than 3mm. Use a drill bit 0.5mm thinner than the screw for metal that is thicker than 3mm.