Torx Countersunk Self Tapping Screws. Manufactured from A2 304 Stainless Steel to DIN 7982 AB Point. (ISO 14586)Please note that these are sold in multiples of 10.Countersunk head self tapping screws are used to create their own threads in a pre drilled hole in plastics or even thin sheet metals. Usually screwed into a countersunk hole to a create a smooth flush fit on the work surface. Driven by a Torx driver which offers more grip than other drive types.Manufactured from A2 Stainless Steel these offer good corrosion resistance and are almost non magnetic.