The drafting parallel straightedge bar offers an aluminum comfort grip that makes it simple to move the straightedge across your drawing surface, so you can create straight lines wherever they are needed. Additionally, the rigid construction offers a frictionless operation using nylon rollers that are located under the blade. These rollers ensure a seamless glide across your work area. The edges of the device are elevated in order to prevent ink from smearing and the brushed aluminum surface offers resistance to perspiration and corrosion and doubles as a ledge for your pencil. All of the mounting hardware and installation instructions are included with the Paral-Liner Deluxe Mobile Parallel Straightedge.