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#10 Hex Washer Head Self Drilling Sheet Metal Screws 410 Stainless Steel Choose your Length and Quantity 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.General Product InformationHead Style : Hex WasherDrive Style : External HexDrive Size : 5/16″Screw Size : #10Length : Select Desired Length in Drop Down MenuQuantity of Fasteners in Package : Select Desired Item Package Quantity in Drop Down MenuDetailed Product Information:Head Width Flat to Flat : 5/16″Flange Diameter : 0.348″Head Height : 0.151″Thread Diameter : 0.190″Thread Coverage : Full ThreadPoint Style : Self DrillingDrill Point size : #3 (1/4″)Max Drilling Thickness : 0.150″Key Notes:Hex washer head self drilling screws have a drill point at the tip of the thread drills its own pilot hole in to metal allowing for quick installation and fastening while saving time and effort with just a single stepMade from an ultra strong stainless steel grade 410 giving them the ability to drill through sheet metal and stainless steel while still being wear resistant and offering a mild chemical corrosion protection; these screws are not intended for use with aluminum as the higher iron content in the fastener will cause embrittlement; 410 Stainless steel is always MAGNETIC due to the higher iron content giving the drilling capabilitiesThese screws have a hex head that can be driven with a nut driver or socket and can be adjusted with a wrench; the built in flanged washer adds a secure grip to the material being fastened into while also preventing the head from crushing thin metalThe self drilling point also referred to as a tek can self drill metal up to a thickness of 0.150 inches and is best used with a lot of pressure and a slow drill speed; if drilling too fast you could run the risk of over heating the metal drilling tip which could cause it to wear out or warpFastenere brand self drilling tapping screws will tap their own thread into the material being screwed into creating a long lasting vibration resistant connection that is the choice for use with corrugated roof siding and sheet metal applications