I have never seen any Harbor Freight products which I would want anywhere near my shop, and certainly NOT on anything as critical as a jack stand.
After having a Harbor Freight anvil split open, after having a friend injured by a casting defect in a Harbor Freight air tool, and after seeing a Central Machine "lathe" with so much play in the leadscrew that you couldn't accurately cut 20 tpi threads, I don't think I am ever going to go anywhere near a Harbor Freight store ever again.
You need to get out more. Take a look at the stands from Mac or Snap-On or any of the industrial supply houses. They cost more, but they are made from real metal.
Hit it with a five-pound hammer. Does it leave a mark? Does it leave a deep indentation? Look at the welds: are they holding shear tension or just compression? Do they look nice and clean or do they look ragged and full of voids? Or are they just tack welds in the first place?
Jack stands are holding several tons of metal a few inches above your face. This is NOT an application where you want to get cheap products. Get cheap wrenches and cheap screwdrivers. Get a cheap dwell meter. Don't get cheap jackstands.
--scott