The 4 inch Log Cabin Trim Tool features exclusive markings to create perfect four inch finished Log Cabin; Half Log Cabin; or Courthouse Steps blocks. After adding each round of ?logs?, place the appropriate centering square on the tool 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 width and center square are printed right on the tool! Combine these blocks with 4 inch curvy log cabin blocks (Item CGRJAW6MINI) for unlimited design potential.