HI Barbara and all you wonderful ladies, I have enjoyed all the tips on Tuesday and spent over an hour looking at the web sights. The rulers I usually use are Omnigrid, the green ones. Others are just as good, just do not mix them with June tailor, Olfa, Fiskars and others because they might be slightly different. I had several blocks off using a long ruler and then a small square of another brand. I try to be precise and most of the time my blocks come out the correct size the first time. Best wishes for a great day tomorrow and the rest of the week.