The TRACER Speed Square 175mm (7 Inch) is a versatile roofing and carpentry marking tool. It features quick and precise marking with pre-calculated angle guides, allowing for simple 0° - 90° marking. The square includes both horizontal and vertical rulers for easy measurements from the inside edge or T-section. Its clear, hard-wearing scales are marked in both Metric and Hip + Valley rafter measurements, with 1/3 Rafter scribe guides for accurate marking. Constructed from robust yet lightweight aluminum, this speed square is designed for durability and professional use on any worksite.