I am, basically, happy with these screws. I have purchased them twice and they serve my purpose with a couple caveats. I ordered charcoal gray to be used with snow guards for my roofs where I installed charcoal gray aluminum shingles. However the screws, while labelled that color, actually look more like a light brown so I had to spray paint the screws so that they would match.

Also, the second batch that I ordered was short a half dozen screws and another couple dozen were missing their washers. Fortunately, by my calculations, I should still have enough to do what I need but buyers should just beware that quality control at the manufacturer may not be ideal.