We used a Supergate IV (mounted, of course) for our deck and it worked great for many years, being left out year-round in our CO weather.
It isn't black but it's possible you could paint/stain it if you really wanted to. When our deck was stained (with an opaque stain), the guy put the stain over the attached hardware from the Supergate and it then blended right in with the rest of the wood.