Incra Rule: a ruler with tiny holes to mark exact lengths


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In the UK, we get to have the honour of paying 360 quid for the knockoff. The real deal is priceless/unavailable.


In addition to the basic rulers, Incra also makes fantastic layout and measuring tools designed for carpentry - but I use them all the time in my jewelry studio. My favorite is an 3"x7" stainless “ruler” that has a very solid block of aluminum channel attached at one end, making for a small T-square. ( I use it for tracing lines and grids on raw materials and for lining up stock on my small milling machine. When not in use, it sits on my bench and I use the super-useful holes for setting my dividers precisely. They make a wide variety of these, and so far I love every one I’ve tried.


Every fraction? But there are aleph-null of them! The ruler must be fractal!


Can’t you just order from the US? I will send you five for £359.99!


Nah thanks. I think I’ll just go for the 20 quid non-knockoff from


“Patent Pending!” I certainly hope this is one of those cases where that means, “We’ve filed a patent application but there is no chance in hell that it will actually be granted”. The markup on this thing has got to be 50,000% or something.

I found it quite infuriating back in the day that it seemed impossible to get a decent stencil for organic chemistry (featuring pentagons, hexagons, the cyclohexane chair, etc) for less than $20. At least there are 3D printers now.


Still the case. I’ve learned to make do without those on fucking principle. I do have a jigsaw though… problem is I have too many projects.


I don’t actually have any need for those, but now I want them. Curses!


Nice, but there’s a special place in hell for users of decimal inches (and an even deeper one for decimal feet… I’m looking at you US Forest Service.)


Sounds like something the hero gets threatened with in a Max Mad spinoff title


I’m guessing that you might have strong opinions about ISO 2848?


Unfortunately, decimal inches are still used a lot in electronics.


I have a set of these. It’s a metric 150mm set with T-square, the corner ruler and normal ruler. I like 'em a lot. I think I bought them from an eBay seller that shipped to Europe (search for ‘incra metric’).

It’s very satisfying being able to mark things in sub-millimeter accuracy with repeatability. I’m a pretty shitty woodworker but still I feel these have helped me achieve better results when accuracy is needed. To me this is what these are about:

You can slide the T-square on the work piece and mark a long parallel line accurately and very easily. The T-square is the most used so I would start by purchasing that. I don’t think I’ve ever had a need in my small scale projects for the longer 300mm versions, so I would start with the shorter ones.


Am I the only one who keeps reading that as Inca Rule? I’ll admit I was a wee bit disappointed that I was not able to learn how the Inca measured things. Ah well. :stuck_out_tongue_winking_eye:


You cross the lines to multiply!


I’m a big fan of their cola…


The Incras are nice but for my everyday carry I go with the Starrett C404R-48. Sometimes I’ll switch it up and go with the C607R-48, especially if I’m doing some airframe or centrifuge machining. The only thing better than a ruler that goes to 64 is a ruler that goes to 100. I’m searching for good Kevlar scabbards tho.


I have them as well. Also the giant Incra table saw and router fences, and I have spent way too much at But they are such nice tools.


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