Faithfull Aluminium Roofing Square 300mm (12in)This Faithfull Roofing Square is designed to provide carpenters with a quick and accurate way to mark out for many building projects and is widely used when constructing roof rafters. It is manufactured from aluminium and has graduations marked with degree measurements, which helps to simplify material layout and timber cutting. Quick, accurate and able to calculate hips, valleys and angles on roofs making it a truly flexible square.