The Faithfull Prestige Adjustable Quick Roofing Square, also known as a layout or angle square, rafter square or speed square, is the go to product for many carpenters. It is designed to provide a quick and accurate way to mark out for many building projects and widely used when constructing roof rafters. It combines the functions of a combination, try and framing square and can be used to make basic measurements and as a saw guide for 45° and 90° cuts. It can be utilised as a protractor allowing the measurement of angles and pitches. This makes light and fast work of cutting wall shoulders (bird beaks) or rafter ends. The adjustable protractor arm can be locked in place with the brass screw - a useful feature when making repetitive cuts. This heavy-duty version is manufactured from aluminium using computer numerical controlled (CNC) machines. The black anodised finish offers enhanced corrosion protection and the laser engraved scales give outstanding measurement accuracy. Faithfull 'Prestige' products are manufactured to the highest standards and are covered by a 10 year guarantee. Size: 300mm (12in). Description: Prestige Adjustable Quick Roofing Square Black Aluminium Size: 300mm (12in)