This professional 30cm aluminium speed square is an essential tool for precise measurement and marking in woodworking and carpentry projects. The black metric rafter square features comprehensive conversion tables and measurement markings, making it invaluable for both professionals and DIY enthusiasts. Its durable aluminium construction ensures longevity while maintaining accuracy. The triangle ruler functions as a protractor, allowing for precise angle measurements and markings. Perfect for rafter calculations, stair layouts, and general construction work, this versatile tool combines multiple functions in one convenient instrument. The clear, easy-to-read graduations and markings are permanently etched for lasting visibility. Its 30x30cm size provides ample working area while remaining portable. The square's design incorporates both standard measurement capabilities and specialised features for advanced carpentry work, making it suitable for various construction and woodworking applications. Whether you're cutting rafters, marking angles, or checking squareness, this tool delivers reliable precision.