These rulers are awesome. I am making 3.5" blocks. Trying to trim up 1" half squares is impossible with a regular ruler. The 2.5" square is perfect.
Just starting to use it, but I think this will help my squaring off a lot. These specialized rulers may seem expensive, but they make life so much easier. A special treat.
Just received my order and had fifty half square triangle units waiting to try it out . It really works, took no time to get them all trimmed perfectly. And then to press on the gypsy wool pressing mat. Great