Pronese Adjustable Roofing Square 12-Inch, Aluminum Alloy Rafter Square, Metric & Imperial Carpenter Square Set, Precision Speed Square Carpenter Pencils Woodworking Tool SetOptimized Design: This multi functional roofing square set really works a treat! Perfect tool to get straight edges and lines with the lockable and adjustable protractor arm. The cuts which line up closely with the mesasure on the square allow you to scribe parallel lines more accurately. What's more, the brass screw of the adjustable slider is bigger, so easier to tighten loosen. The brilliant kit is so versatile! Strong Quality: In terms of quality,