findmall 2-3-4 Blocks Matched Pair 23 Holes (2"x3"x4") 234 Accuracy Ground Machinist Set Up Blocks .0003" HRC 55-62

spent about 30 minutes getting crud and metal shavings out of the holes. Otherwise they are pretty solid appearing.update: got some of the greasey crud on my shorts. There is a lot more crud in the holes than I originally noticed.second update: spent a good amount of time cleaning them up, and they are great. I was curious and looked at prices on other 234 blocks, and realized these are only cheap cause they don't clean them up for you.

I measured these on a granite surface plate using a height stand with a .0001” indicator attached, all calibrated equipment. All sides measured parallel within +/- .0001. Flatness was virtually perfect on the matched pair.Others have mentioned the countersinks are pretty rough on their surface finish and I agree. However, all threads and faces are burr-free and function correctly. Purely aesthetic, but considering the price I can’t complain.

These are perfect for setting up wood working projectsThey give you 3 exact different sizes without using a rulerThey are milled way better than a tape for ruler plus they can be bolted to another set if needed

I purchased this to help with model building and I’m sure it’ll be fine.But the blocks arrived covered in some nasty oily kind of grease, likely from machining the holes in them? I’m not sure. It’s been disgusting, and the paper that we’re wrapped around both of them were covered in it too.I had to get a brush and dish soap and work it, also letting it sit, in order to get it to the point where my hands don’t feel disgusting just holding my them.I don’t figure these should arrive in this state.I can’t tell if the holes cut in it are supposed to be precise. They don’t appear perfectly centered but seem ok. Some of them appear to be threaded but not all.

Holes are not even close. When I screw two blocks together I get a 1/32" gap. Holes are not drilled center. I can tell without even using a tape measure... these are cheap blocks so you get what you pay for.

I don't have any instrument that I can measure down to .0002, but I can measure down to .000'sI can definitely say they are accurate down to at least a thousandth. And I suspect the claim of 2 ten thousandths is probably reasonable. They are more than good enough for anything I need to do. (obviously since I don't have anything that can measure a smaller value, I must not be working at that level, right?)I am disappointed that the only threaded holes are on the face sides... None of the edge holes are threaded. The countersink on the holes is a little chunky looking, but doesn't interfere with use or accuracy.Is is true for most of these kinds of items, they come in that nasty mineral oiled paper stuff, so have your gloves and acetone ready to clean 'em up.

These are reasonably sized blocks of steal that work great for holding things in place. A must have for model building.

Quick, easy and accurate to set table saw spacing or to verify 90 deg angles