#12 x 2-1/2 Self Drilling Screws Flat Head Sheet Metal Stainless Steel Qty 250. Self-Drilling Screws, also known as Tek screws, eliminate the need for a pre-drilled hole. The length of the drill point determines the material thickness which the screw can reliably penetrate. When selecting a self-drilling screw design, it is important to consider the material thickness and type of materials to be joined.These sheet metal screws are highly versatile and are used to attached metal, wood, fiberglass and plastic. The sharp threads draw material together and ensure a secure hold. Quantity of Fasteners in Package : 250. Tracking is provided on ALL Orders. UPS Next Day Air is available, Please inquire for pricing. For YOU, we constantly strive to find ways of improving our performance. The item "#12 x 2-1/2 Self Drilling Screws Flat Head Sheet Metal Stainless Steel Qty 250" is in sale since Tuesday, August 01, 2017. This item is in the category "Business & Industrial\Fasteners & Hardware\Screws & Bolts". The seller is "lightningstainless" and is located in West Hempstead, New York. This item can be shipped worldwide.