The Log Cabin Trim Tool Two Template features exclusive markings to create perfect 6 or 12 inch finished Log Cabin; Half Log Cabin; or Courthouse Steps blocks. Doesn’t matter which size you choose, they are both constructed in the same way. After adding each round of “logs”, place the appropriate centering square on the ruler over the finished center square and trim. Since each round is squared up before the next set of logs are added, the results are spectacular. The cutting requirements for the center square and the strips are printed right on the ruler.