WEN 10423 3 x 2 x 1-Inch Steel-Hardened Precision 123 Blocks, Two Pack

I bought these for quickly aligning products and jigs for my laser engraver one the center axis.

Good quality. Came in very accurate.

The description specifically states these contain 23 threaded holes tapped (3/8-16 UNC)

A decent pair of 1-2-3 blocks. I havent actually measured them at all but otherwise they do what I need them to.

These 123 blocks are cheaply made and not suitable for more precise work.

Thickness seem even parallel. Was dissatisfied with the the accuracy of the drilled holes. While the line of holes appear straight, they are not centered to the block side. One was off even to the eye, as much as 1/16”. Fit and finish is poor, the chamfered edges are uneven. They will suit my needs for woodworking as spacers and quick reference checks for 1”, 2”, and 3” but if I was a Machinist, I would spend my money on something with a more reliable reputation for precision.

Got these a few days ago and was pleasantly with how accurate and well made they are. Checked all sides for accuracy and squareness using calipers for size and a combo square for squareness. They seem to dead on accurate, excellent product.

I finally decided to buy a set of 1-2-3 blocks and now I cant imagine how I lived without them for so long! Super useful for both metal and wood working. They are great for quick setup of table saw and band saw blades to make sure they are perpendicular to the table. They work great as spacers for indexing cuts and even work as parallels when machining metal. If you dont require that extra 0.0001 tolerance these blocks are just as effective as blocks costing 30x more.

very nice grind and chamfered holes, threads in block except bolt threads great. I would definitely buy more.

Well made for the cost