No more measuring your logs "BEFORE you cut". The "Rule" measures the logs "AS you cut"! * The "Rule" quickly snaps on and off, Plus, it can be flipped from right to left or vice versa! * The "Rule" can be telescoped in, so it"s out of the way when cutting down trees! * If you keep the "Rule" level with your log your cuts will be straight every time! * It"s like having an extra man on the job and it would make a great gift for Fathers Day!