2-4-6 Blocks

These are the cheapest 2-4-6 blocks, bigger brother to much more common 1-2-3 blocks used by machinists to do setups on milling machines (or other equipment). In this video I measure the precision of workmanship of cheapest blocks I could get off Amazon - for under $100 USD. I am surprised that the blocks not only are matched but also hold stated dimensions of 2", 4" and 6".