Swanson Tool SM072 (model 25) 72-Inch Sheetmaster Cutting Guide Use to locate pitch across 4 x 8 sheets Constructed of high-grade aluminum alloy Elimimates the need to use an angled piece of 4x8 for a pattern, or measure the difference of an angel, or chalk a line to mark the angle on a piece of 4x8. Will adjust from a 1/12 to a 24/12 hip & valley and from a 1/12 to a 12/12 on gables Has degrees used on switch/pitches.