Lots of types of steel out there. No clue how many different types.If you look at the website pics closely and read the description you'll notice it's forged steel pieces with a welded construction - not cast.
Still a great price on what seems to be a solid unit.
Take say a 1” ball bearing and drop it on the flat. Lots of bounce. It’s really good and tough. If it just hits the steel and more or less just dies there… not so tough. I have an 18” piece of railroad track on my bench. Drop the bearing on that. Probably bounces 5 times. Want a bearing that size? Go to an auto repair shop and see if they have a dead CV joint in the garbage. Yank a bearing out of that. Also great for cleaning out the hose on my clogged vacuum hose.
I do recognize the vise. Never heard the term’ bullet’ vise, but that can be added to a ton of stuff I’m not familiar with the term.