1.HIGH QUALITY STAINLESS: These Hex Washer Head Self Drilling Tek Screws are 100% 410 Stainless Steel which is one of the highest forms of corrosion resistance steel, making it last longer than other hardware on the market today. 2.SELF TAPPING: Our hardware is very strong and is great for both indoor and outdoor use. The stainless steel is superior to regular steel and provides excellent rust resistance in water applications. 3.HEX WASHER HEAD: Stripping a screw head is a thing of the past with our Hex Head screws. Put a socket on that impact or drill and fasten away! 4.GREAT TO KEEP AROUND: Handan Shuang Lan is great to have around for use in wood and wet environments. Bolt Dropper Screws are of the highest quality available on the market and we stand by our claim 100%. They are strong, corrosion-resistant, and will support all of your projects. 5.LIFETIME GUARANTEE: We are so confident that our product is the best on the market that we offer a NO HASSLE LIFETIME GUARANTEE.Sheet metal screws, or tapping screws, are highly versatile. Though they are designed to attach metal to metal, they’re also used to attach metal to wood, fiberglass, and plastic. Great for general repair around the house, their sharp threads draw materials together and ensure a secure hold. Sheet metal screws are fully threaded with a sharp point. A pre-drilled hole is required for installation. *Use for sealing metal or wood in indoor and outdoor applications *Metal construction *1-1/2 in. long *Hex-washer-head style *Self-tapping design Hex Head Self Tapping Screws from Handan Shuang Lan Metal are used for sheet metal to sheet metal fastening. These screws come with features which help them in tackling the constraints of metal to metal fastening. The screws are heat-treated to increase their strength and holding abilities exponentially. It is available in stainless steel, carbon steel, and alloy steel to bear more wear and tear while also making it more corrosion resistant. Since these screws are self-tapping, there is no need to drill a pilot hole before using them. Despite mostly being used for metal to metal fastening, it is required to use a washer with these screws to ensure that the structure doesn’t loosen up over time. At Handan Shuang Lan, we take pride in the quality of our fasteners as well as our customer service. We also specialize in custom orders of large sizes and the prompt delivery of the same.