The Martin Universal Pro-Draft Parallel Straightedge Kit with Adjustable PEB Board is perfect for eliminating the need for an acrylic straightedge or T-square. It is designed with an inking edge and ensures accuracy. It features a convenient carrying handle and dual locking knobs that allows you to align the straightedge or change the angle quickly. The ribbed strips on the back keep the Pro-Draft Parallel Straightedge Board perfectly positioned on the edge of a work surface or your lap. This two-piece kit is available in a wide variety of sizes making it easy to find just the right size for you. Martin Universal