Hilitchi 410 Stainless Steel #8 Hex Washer Head Self-Drilling Sheet Metal Screws - 200-Piece Assortment Kit with Drill Point for DIY, Construction & Metal Roofing Projects

Like the variety of sizes and use on everything,just need magnetic bit to hold them on your drillThe only gripe I have about this is that it would seem to be a serious pain to connect large wire to it. I am using 4 gauge and I didnt even try. Instead, I used a 'hot-in-run' spare fuse to run a wire to it, using it as a switch to a larger "dumb" relay. works great so far.Head size very smallI have returned a similar product and ordered this one and way better quality and comes in an organized container not in a plastic.The price is honestly hard to beat. As some have previously mentioned, you should expect stainless steel to be more brittle than normal mild or Grade 5/Grade 8 fastening hardware. What does this mean? You should not expect a 2" screw to self-tap into 2" of steel. These are self-DRILLING screws, which are different than self-TAPPING screws. At first I was concerned that the drill spade was too wide for the screw. But I secured a number of e-tracks straight into the steel walls of a trailer with no issues. I wish they came in a self-tapping version instead of a self-drilling version.The washers themselves are more of a rigid plastic, so a trailer use would be a perfect application because the washer has just enough oomph to prevent metal on metal ratting. Either way, if you are close to a bulk fastener distributor, I would go to them first. If you are far in the desert like I am sometimes, it's probably best to just order these.would highly recommend anyone buying from this merchant. very satisfied and good peopleStainless Steel #12 Hex Washer Head, Self Drilling Sheet Metal Tek Screws in assorted lengths. Each screw has a silicone clear washer for sealing or just to grip against metal.Needed some assorted SS self-drilling screws. Looked at local home modeling retailers but no option for assorted set. These screws worked as designed. Thread and drill tips were good machined. No problem in installing on metal pipes.