TaytoolsPair Hardened Steel 123 Blocks and Attachment Hardware Kit

I checked the measurements of these blocks with my Starrett caliper, and the measurements are perfect.

Seems accurate

These 1-2-3-4 blocks seem to be well made and help make tool setups, squaring, and 90 degree glue ups a breeze. It came with bolts to group them together but they are a little challenging to use (the bolts are small and the inserts tend to spin).The blocks came wrapped in an oil soaked paper which I assume was to prevent rust from forming during shipping but it was an oily mess and required clean up before I could use them. It’s still embedded in all the little holes so I will working on that for a while. You don’t want get that stuff on your wood projects. Alcohol seems to cut through the oil and I sprayed it with an anti rust spray that is made for sharpening chisels and that’s working well so far. It also would have been nice to have a little box to store them in but that will make a nice weekend project down the road.

ok, have not actually used this other than unwrapping and cleaning it but does measure square.It came well wrapped and covered in oil so that had to be cleaned.Machining looks good, no case but good deal for the price.Will be used for making model structures where I need square walls.I think it will be fine for that, good tool to have in your kit.

Extremely useful tool for dealing with precise dimensions of one, two, and three inches with precise right angles with below surface hardware for connection and alignment.

Great quality and a great price.Definitely glad I purchased these!

The fasteners that let you connect these are a smart, useful feature

I have purchased these type blocks before, and they work well for what they are designed for. The published tolerances are fairly accurate, but I use them for welding jobs and I don't need machinist accuracy. They are great for the money.