I don't know much about these things. I'm not even sure when you're going to need aluminum machine handles, but if you are in need of those, then you can take a look at that site. I think the site also contains a lot of mechanical tools of the similar kind.
Just don't ask me about the difference between those tools, though. You're not gonna get any useful information from me. As I said, I'm no expert when it comes to mechanical-related kind of things.