1-2-3 Blocks Set Matched Pair .0002" Squareness Hardened Steel Setup Blocks Ultra Precision Machinist 1"x2"x3" Blocks for Machinist Woodwork Metalwork (1 Hole)

I bought these for my Benchrest rifle. The bipod wouldn’t elevate my rifle with respect to the rear rest and the rear rest didn’t have enough adjustment to suit the bipod.These blocks worked perfectly for my application!

1-2-3 blocks could be renamed to gauge blocks for woodworkers; they are accurate in linear and angular dimensions. Also, try to buy them with some threaded holes. Versions come in both metric and Imperial thread sizes. Threaded holes do improve their utility.

Great for the price.

I have not yet used these 123 blocks. They ARE EVERTHING, though, that I expected. I WOULD purchase a another two123 blocks set if needed.However, I also bought two sets of two blocks in each set sometime last spring (Feb.? thru May?) and NEVER received them. That ad was a scam. Not your fault. Robert Bryan SECOND Usa

OK, so this is not an a traditional machinist use for 1 2 3 blocks, but they are perfect for my needs. I have several sets of drilled 123 block I use to make square wall or as weight laying HO model railroad track. I use these constantly but have never used the drilled holes. I often wished they were a little heavier and a lot less expensive. I have even look at 234 block but I am not paying $50+ a pair. These looked OK and the price was better. Without the drilled holes they are much heavier, almost perfect for my uses. Who knows the true dimensional tolerance and I don't really care if they develop a little surface rust from handling. I am buying 2 more sets tonight because this are the best I have found for general model railroad building

This did exactly what I needed it to. It is perfect for making sure items are square in my laser machine. Also works for aligning my gantry in my laser machine.

exactly as ordered