A2 Grade Stainless Steel Self Drilling Screws. Self-drilling screws are sometimes known as Tek screws. These screws drill their own pilot.They are different from self-tapping screws, which require a pre-drilled hole to work effectively. The self-cutting point penetrates the sheet metal prior to the threads engaging. These screws perform best in metal and should not really be used in wood. Suitable for self-drilling through 1.0mm - 3.5mm steel. Please note that stainless steel screws are not as hard as carbon steel screws, therefore care should be taken not to over-drill the screw, which could lead to shearing of the head or shredding of the recess. Please use the drop down menu to view all our sizes available. This item is in the category "Business, Office & Industrial\Fasteners & Hardware\Other Fasteners & Hardware". The seller is "massiveattack007" and is located in this country: GB. This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia, New Zealand, Egypt, Reunion, South Africa.