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

I have measured them against another set of set-up blocks, and they look and feel like they're accurate. They're solid, with a nice, heavy feel. Maybe I just got lucky, but the blocks I received don't have any of the grease and oil that so many of the reviewers have complained about. Immediately upon opening the box, I noticed they didn't feel greasy at all. I then took a clean paper towel and rubbed all sides vigorously. The towel stayed as dry as the moment I tore it off the roll. Pretty darned happy with my purchase.

I measured the 25mm sides of both blocks with a Mitutoyo micrometer. They were long by 0.004mm and 0.005mm on average, which is perfectly fine for inexpensive blocks like these. Had I scrubbed them with brake parts cleaner and cooled them to 20 C, it might have shaved another micrometre off. (Note that they do come covered with anti-rust grease; I only wiped them down with paper towels thoroughly and then with a cloth that was damp with isopropyl alcohol.) The longer 50mm and 75mm sides I measured with a vernier caliper and they were correct below the resolution (0.020mm) of the caliper. For the 90 degree angles, I checked with a bright light, holding them in various positions, flipping them, etc., and they seemed very good, but this is not really precise. I did not test any of the screw threads. I would buy them again.

These easy to use 123 blocks are basically a no-brainer for nearly every woodworker. Excellent for setting blade heights, or distance to fence or other layout situations. Especially useful with setup bars. These are the perfectly sized for 1 inch, 2 inch or 3 inch spacing. They will last you for many years, they're a great value. I've had my set for 5 years. The only downside is they are steel, so do what you can to prevent rust. I'm in a humid climate, so it's an issue here. I've cleaned them and applied wax recently, hoping that that will help long term. Easy to store away with your other layout tools.

Well made. Very accurate. Excellent value. Coat it with paste wax to prevent rust.

I saw complaints about thye sticky oil on these blocks. That didn't bother me, I like my tools to come in a protective coating. This stuff man not be MIL-SPEC Cosmoline, but it's darned close, and that's a GOOD thing. I wiped them down with solvent (naptha, I think?), which worked great. Then I ran a Q-tip through the holes to extract most of what was inside, leaving a slight coating, which I wanted. Any residual oil inside the holes is viscous enough that it hasn't oozed out. I don't know what steel this is, but I suspect it will rust pretty easily, so I run an oil-rag-in-a-can (a la Paul Sellers), over the blocks whenever I've used them. They haven't rusted at all, as of now. I saw reviews that talked about the inaccuracy of the hole-allignment. They are correct, the holes aren't aligned perfectly. That doesn't bother me, as I don't connect the blocks. For me, the holes only serve to make the blocks lighter, so that's OK for me. I also saw reviews that said the dimentions weren't correct - it was clear that they received METRIC blocks. Mine were spot-on in inches. For quick checks on 90° blade and fence set-up, these are just what I needed, For setting fence-to-blade distance at precisely 1, 2, 3, 4, 5, or 6 inches, they are quick and accurate. That's all I wanted. I suspect the steel is soft enough that dropping one on concrete will do major damage. So try not to drop them on concrete. Me? I'm clumsy, and will likely drop them, time to time. I put pieces of old carpet (free from the dumpster) under my bench and all my major power tools. God willin' an' if the creek don't rise, these will last me a lifetime.

Very great for setup to have sitting on the bench for welding jigs and stuff like that. Also really good for use on a mill.

One two three machinists blocks dead acuret For positive setups

If you plan on taping holes you will need these to make sure you tap a straight hole or you could mess it up so it worked well for that

Gut verpackt in Ölpapier angekommen, keine Spur von Rost. Erst mal entfettet und mit dem guten Mitutoyo Messchieber kontrolliert, alle Maße 0. Das ist so genau genug für mich. Messung mit Bügelmesschraube folgt, ist für Holzwerken aber egal. Alle Gewinde passen und auch die Durchgangsbohrungen. Das sind 100 Punkte!

Well packaged to prevent rust & damage in transit. Measured within advertised specs for accuracy. A great little bargain.

Great quality, bought a second set.

Bella gente, il prodotto arriva in scatolina di cartone con stanpato il nome e codice prodotto. All'interno non troverete istruzioni o foglio illustrativo ma solo i due blocchetti incartati con del celofan, in una bustina di plastica...consiglio di munirvi di straccio e petrolio per una bella grassata. Prodotto consigliato per hobbistica.

I use these a lot as a machinist. They are accurate and well made.