The 10 in. Log Cabin Trim Tool Duo, designed by Jean Ann Wright, features exclusive markings to create perfect finished Log Cabin; Half Log Cabin; or Courthouse Steps blocks up to 10 in. square. This ruler features two sets of markings -- one set for 1 in. finished logs, and additional markings for 1/2 in. finished logs. Make log cabin blocks with all the same width of strips, or combine the two widths for limitless design potential! After adding each round of logs, place the appropriate centering square on the ruler over the center square of the block and trim. Since each round is squared up before the next set of logs are added, the results are spectacular. The cutting instructions for the strip widths and center square are printed right on the tool! The 10 in. Log Cabin Trim Tool Duo comes with fully illustrated step by step instructions or scan the QR Code printed on the ruler to view a video demonstration. The ruler slides easily over the fabric until pressure is applied. Then, the exclusive gripper holds the fabric in place while cutting, eliminating slipping and miss-cuts!