【Ideal for Measuring Tools】：The triangle metric ruler can be used as a protractor,miter,line scriber saw guide,framing square and a ruler 【Two Measurements】The carpentry scribing tool features metric and imperial measurements with clear graduation 【High Quality】The triangular rule is manufactured of high quality aluminum alloy with black matte finish to prevent glare, corrosion resistant and durable, not easy to break. 【High Precision】Its thick edge can be used directly with the saw against the square for cross cuts or angled cuts using the etched protractor scale, let you quickly and accurately mark your cut lines on your stringers. The rafter square has scales for cutting hip, valley and jack rafters 【Widely Application】 Triangle scale ruler is suitable for all building and remodeling projects, also hobbyists, home builders, manufacturers and artists. Product description Triangle Ruler 12 Inch Aluminum Alloy Rafter Profile Triangular Rule High Precision Easy Read Square Protractor