Features:Strong cast aluminium body with clear， embossed imperial graduations and common rafter conversion tableFeatures a protractor scale 0-90��Use as saw guide for angle measurements and cutsIdeal for all building and remodeling projectsAlso useful for hobbyists， home builders， manufacturers， DIYers & artistsMaterial: Aluminum AlloySize: Approx. 26x18.6x18.5cm/ 10.24x7.32x7.28"Package Included:1 x Aluminum Alloy Roofing Rafter Square Triangle Ruler