Well made trolley. The bolt joining the halves of the trolley is 1" rod, pinned in on one side, rather than a hex bolt, so one side of the trolley is nearly zero clearance (no bolt head protruding past the outside edge. This suited my need very well.
It’s a little narrow. Really pay attention as to how wide your beam is. I have a Harbor Freight 1/2 ton also. It’s about an inch wider. This particular beam trolly probably would not work where I have the harbor freight beam trolly. Seems like it will work just fine. Paint a little scuffed but packed well enough.
We attached this to our basement beam as a zipline so the kids can slide on. Plenty stong for this and the price was right. We had to add a couple washers to make it fit properly. Note: It is loud upstairs when its being used but Oh the fun!!!!
Everyone has a metal I-Beam in their basement...well i put mine to good use. I have a heavy punching bag that has this big awkward stand that was always in the way! Now i can roll the bag out of the way and bring it out when i want to let off some steam. The adjustability lets it fit many different sized beams, so you dont have to worry about that
Mayhem 
