Industrial finish Snap On are top quality and often very cheap on eBay. I've had to refinish these, as someone ground or sanded off some finish and marked them.
These are not impacts, but rather unplated regular sockets.
I like to rub a white crayon over the stampings to help me read the sizes without my reading glasses. The crayon holds up surprising well to a variety of oils and fluids.
I'm trying to collect a full set of Snap On industrial finish tools in inch sizes. So far, I have a full set of extensions, allen bit sockets, 1/4", 3/8", and 1/2" Dual 80 ratchets, and almost all the available 1/4" and 3/8" sockets. I even have a set of GSOEXM combination wrenches. These are no longer made and have the flank drive plus open ends. Yet to find a cheap set of inch sizes, but I do have some some hi performance series double box wrenches.
I think the black tools are really cool looking. A little oil and a bit of black crayon gives them a nice luster (just rub the crayon on and buff it off like any other wax). But I don't care for these for automotive work as they are very easy to loose. The white crayon in the markings helps a tiny bit, but not enough. I use these in my machine shop and for household stuff.