WEN10423 3 x 2 x 1-Inch Steel-Hardened Precision 123 Blocks, Two Pack

They measured up pretty good...Not being a machinist they didn't have to be 100% accurate but they are close enough for my hobby shop works

WEN 123 blocks in Metric. I checked both blocks with my millimeter scaled dial calipers. Both blocks read within 2/100 mm on all three axis, and the length was within 1/100 mm which is the accuracy limit of my tool. Very impressive for 24 quid!.Bonus joy: Nearly all 123 blocks on this site have US SAE 3/8 threaded connection holes and the untapped holes are too small for the connecting bolts of the threaded size to pass through rendering them next to useless.……..NOT SO WITH THESE…..The M10 threaded holes are smaller than the pass through holes allowing M10 bolts to join the blocks as intended…BRILLIANT, THANK YOU WEN!.They arrived tightly packed without room to ‘chink’ off each other. Wrapped in a grease proof paper with some kind of greasy surface preserver..My only miniscule ‘complaint’ would be the blocks would benefit from a cheap blow moulded or plywood case and an extra couple of quid on the price to cover that would add even more value for money.

Very useful tool.

Seems to be machined to the right size, but the corner / edge machining is sloppy, which gives an illusion that they're not square.

1,2,3 get a 100% from me very handy to have in the work shop for many reasons, simple but extremely versatile and useful

Really accurate all round so great for the cost.

Using these for quick spacing of projects on the drill press. Measured them on arrival, and they are exactly to the dimensions advertised. Shipped with a good helping of grease so corrosion free, one quick wipe down later and they were good to go.

Just what I wanted