Woodpeckers Woodworking Rules have earned a reputation for accuracy, convenience and ease-of-use. Now you can add "versatility" to that list of features. Woodpeckers Precision Woodworking Protractor converts any Woodpeckers Woodworking Rule (except the 6") into an adjustable T-square that can set any angle from 0° to 180°. The Precision Woodworking Protractor simply mounts to the Woodworking Rule using the same threaded holes as the Hook Stop. Now you can use your Woodworking Rule to lay out square and angled lines with a high degree of precision.