FunctionThe triangle metric ruler can be used as a protractor, miter, line scriber, saw guide and tri/meter square, framing square and a ruler, ideal for all building and remodeling projects. High PrecisionIts 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. Two Measurements for OptionalMetric and Imperial, optional. It has a step scale of 0-90. Use as a saw guide for angle measurements and cuts, Ideal for all construction and remodeling projects. High QualityThe carpenter square is manufactured of high quality aluminum alloy with black matte finish to prevent glare, corrosion resistant and durable, not easy to break. Application26 x 18.6 x 18.5 cm / 10.24 x 7.32 x 7.28 inches, suitable for all building and remodeling projects, also hobbyists, home builders, manufacturers and artists.