Paul Sellers recommends a 12” (300mm) combination square as this should be suitable for almost all woodworking projects. He finds the try squares don’t remain accurately square as with the better quality combination square. When buying a square, look out for one with a cast iron head as the ones with aluminium heads tend to go out of square after a while and are difficult to make square again. If you cannot get one with a cast iron head, just make sure you check that it is square before starting each project. The ones with a cast aluminium head can be found for under £10, the ones with a cast iron head are more expensive and can be bought between £25-30.

To view the parts of a square, click here.

🇬🇧We purchased this combination square from Amazon Prime which cost £24.50*.

🇺🇸If you are ordering from the US, we recommend this one from Amazon. Please note Paul has not purchased this, however it seems to fit his recommended criteria.

Set square

*Prices correct as of February 2020

Further Reading

To read more on Squares, we recommend the following from Paul's blog:

Buying Good Tools Cheap #2- The Combination Square


  1. Stephen Eastwood on 17 April 2018 at 3:11 pm

    Hi Paul the guide are a good idea thanks
    So the question is how would you check for square if you have no reference tool.

  2. Manú manú on 5 May 2019 at 11:54 pm

    the squere that is shoun in the picture(Stanley), the body is realy cast iron??
    thank you!!

    Sears Manù

  3. steve on 28 November 2019 at 9:45 am

    I think it’s well worth saving for a good one as well. I bought a Starrett square eventually, it was expensive but the accuracy is bang on and it’s very high quality. I think the model is 33M – 300 (all metric graduations) and it has a hardened steel stock which is probably designed for continuous working metal to metal in engineering. It feels like it will last for ever.
    It was a tough decision but I’ve never regretted it.

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