A Rafter Square is a triangular carpenters' marking out tool, combines common functions of the combination square, try square, and framing square into one. make basic measurements and mark lines on dimensional lumber, and as a saw guide for short 45 and 90 degree cuts.
Aluminium alloy construction
Swing the square until you read the desired angle on the board's edge, and make your mark
Speed squares are a quick saw guide for cutting 45- and 90-degree angles