I needed to trim these down to 1 1/4". I made sure that the 1 1/4" markings were inside the edges of the block and trimmed 2 sides.
Perfect 1 1/4" squares! As much as I don't want to spend more money on extra rulers, this one is well worth it.
I also have their flying geese ruler, which I have not tried yet. You can find more info on their rulers and videos about them here. They have a lot of different rulers available.