Find the exact center of any workpiece up to 12" wide. This rule features INCRA’s patented microfine guide holes and slots at every 1/32" marking on the scale. To locate your position, use a sharp pencil or scribe at the exact measurement and begin your marking. In addition to the top and bottom microfine marking holes at every 1/32", it also has a built-in protractor with guide slots at every 45°, 30°, 22.5° and 5° interval. As with all INCRA products, this rule is made of stainless steel, 100 % American made, and will provide dead-on accuracy.