The tagline on the case says \"Vevor\" \"Tough tools, half price\" —and I think that's a fair representation. This is a well thought out set (in terms of the sizes) and overall, the components are good. The two included arbors are especially nice, and, as advertised, are compatible with the standard brands of hole saws. (I may even like the larger one (with the locking pins) better than my old Milwaukee arbor.) I can't judge yet how sharp the saws will stay. I have a long history with hole saws, switching many years ago from the shallow, inexpensive ones to Starrett, Milwaukee, and Morse saws. (I just looked up the cost on a Milwaukee set that is similar (although it has 21 saws instead of 18, but the same overall range is covered)—it lists for $300—and Starrett and Morse are even more expensive. So, I'm not sure if it's fair to rate these as a comparable tool, or at least on the exact same grading scale as the premium brands. Once you start using hole saws, like any other drill bit, they do get dull. ) I just drilled with a few on a home project, going through both some plaster (not sheet rock, but plaster and lath) and some plywood, and they did a fine job. I think this makes a great kit as a base line set of hole saws. There will be a few sizes (for me, 2 1/4 seems like a popular one) that will wear out and you can decide if you replace those with the premium saws. (I'm not even sure if you can buy something like these Vevor brand as individual saws—but I'd like to see that. If you have an air compressor, using a nozzle on it, to blow air into the holes as you are cutting it, there are several advantages. Mainly, the sawdust in the hole is cleared out, so the teeth don't get jammed (and it cuts much faster). Also, there is less friction, since the hole is not packed with sawdust—so the saw stays much cooler, and also stays sharp a lot longer. The other thing worth mentioning, is what those two pins do on the larger arbor. After you screw the saw onto arbor unti