Designed by Jean Ann Wright, the Creative Grids 10" Log Cabin Trim Tool Duo is perfect for creating finished Log Cabins, Half Log Cabins, or Courthouse Steps up to 10". The ruler features two sets of markings, the first set is for 1" finished logs, and the other is for 1/2" finished logs. Create these blocks using strips of the same width or combine the two for limitless design potential. Once finished, with each round of logs, place the centering square on the ruler over the block's center square and trim. Since each layer is squared up before the next, you end up with amazing results, and best of all, the cutting instructions for the strip widths and center square are printed right on the ruler. Equipped with Creative Grid's exclusive grip, this ruler slides easily on fabric yet stays in place when pressure is applied. Made in the USA.