Wensilon（300pcs）#8×1/2”for Sheet Metal Self-Tapping Screws 410 Stainless Steel Truss Head High-Strength Quick Tapping Screws

Good material screws. It has great rust resistance and magnetism. Super easy to install, we had zero issues. It’s sleek and good looking. Very strong and durable

When I bought these, I was a little bit worried that maybe because of them being stainless steel, they might easily fall off my magnetic Phillips head driver bit, which would get very frustrating. But after receiving these screws and using a dozen or so of them to drive screws through stainless steel sheet metal and into aluminum, that has NOT been an issue at all. Contrary to what some people think, not all stainless steels are non-magnetic. Some are, and some aren't. So don't think that being magnetic means that these aren't stainless, because they most certainly ARE. I was also a little bit concerned about whether or not these screws, being made of stainless, would be hard enough and sharp enough to be able to self tap into stainless steel, but to my pleasant surprise they worked exceedingly well. I was drilling into a commercial Manitowoc stainless steel ice machine panel, and these screws did not even hesitate to bite right into the stainless. And sometimes also one of the problems that you can have when you use stainless steel screws is that they can snap off when you drill into something kind of thick. The aluminum that I was drilling into behind the stainless steel was probably about 2-3 mm thick, and I did not have any issues with this at all, so again I was impressed with that result as well. I can't make an honest evaluation about corrosion resistance, since it's only been a week or so, but even the magnetic grades of stainless steel should resist corrosion better than just plain steel screws. If you are going to need screws to resist very corrosive environments like salt water or acidic areas, you will likely need a very high grade of stainless that is softer, non-magnetic, and harder to deal with because it can break easy, dull easy, and doesn't stick to your drill driver. But these are perfect for most outdoor applications where rain and sun are the biggest environmental wear and tear factors. And you can't beat the value either.

So I know there are different grades of stainless with some being magnetic and some not at all. I honestly didn’t pay close attention to the grade of these screws before I bought them but my usual “test” is whether or not they’re magnetic lol. These being 410 grade are quite magnetic to my surprise, I’m used to whatever grade, either 304 or 316, we use at work which have no magnetic properties.Either way I wanted these for being black and hopefully corrosion resistant. The self tap feature is cool for light work, thin sheetmetal and such. Some reviews slamming these screws for failing to drill holes in various metals need to calm down. Self tapping screws are not high quality drill bits. Depending on the material you plan to use these with you might want to plan on drilling pilot holes first. I've never owned a set of “stainless steel drill bits” if that’s even a thing, so the capability of a self tapping screw I’m sure is limited.

Great product

Worked like a charm no problems

The black finish is what sold me. Great self tapping screws. Nice hold

Very nice looking screws, much less expensive compared to local purchased.

They work pretty good. Not ideal for metal studs 20 gauge or thin metal but you can make it work. Pretty satisfied.