The Multi-Size 2 Peaks in 1 Triangle ruler combines the angles you need to create triangle in a square blocks which require a two to one ratio. The unique keyhole cut-out allows you to rotary cut both angles with one tool. Cut the tall, center triangle from strips measuring 1-1/2 inch ? 6-1/2 inch with no waste. The markings on the ruler show the finished size as well as the strip width required. Cut the side triangles with the other triangle. Again, the markings on the ruler show the finished size as well as the strip width so you don?t have to do the math. The ruler comes with fully illustrated step by step instructions or scan the QR Code printed on the ruler to view a video demonstration.