6-1/2x24 and 3-1/2x24...and also my short cut ruler used the most and also use a lot my 6-1/2x6-1/2. I use about every other ruler I have on a pretty regular basis too...have square rulers in lots of sizes...just depends on the project I am working on. my largest ruler is a 20-1/2" square and I am glad I have that when I need it.