Light Weight Double Side Scale Triangle Measurement Hand Tool" Double Side Scale Triangle Measurement Hand Tool 7 inch Speed Square is a ular pocket sized square that incorporates features of the framing square, tri, mitre, and protractor squares. Common rafter and hip valley rafter scales permit one number references for all cuts. The square is merely rotated to the proper roof pitch value on teither scale to assure the correct angle cut. The slot along the scales will accommodate an adjustable locking pin for