Yellow and Forest Green, Rapid Rafter. The Rapid Rafter is a patent-pending double-sided rafter square. Rapid Rafter not only reduces the amount of time by allowing for simultaneous marking on both sides of the board, but it also increasesaccuracy by allowing the user to mark both sides of the board without moving the product. As a bonus, the Rapid Rafter folds flat to be used as a normal square and to fit conveniently in your nail bag.