Making basic measurements, marking lines on lumber and providing a guide for short 45° and 90° cuts, the Silverline Heavy Duty Aluminium Roofing Rafter Square has a strong cast aluminium body with clear, embossed imperial graduations and common rafter conversion table. The lipped edge allows secure positioning and features a 0-90° protractor scale. This handy tool is not only ideal for carpenters, but anyone in need of a saw guide for angle measurements and cuts. Weight: 125g. Overall dimensions: 185 x 185 x 260mm.