AlvinŽ Paral-LinerŽ 48" Deluxe Mobile Parallel Straightedge The Alvin Parallel Straight Edge 48In is the cream of the crop of the very popular Paral-Liner series. Create perfect and accurate lines with ease as you glide through each movement; your hands will love the soft-feeling but sturdy grip of the Alvin Parallel Straight Edge 48In! Steel ball-bearing pulleys allow the tool’s retractable nylon rollers to “float” over the drawing paper as the blade touches the surface. Constructed of durable phenol-based resin with Plexiglas edges that prevent ink smears, the Alvin Parallel Straight Edge 48In has a brushed aluminum surface that won’t rust or become stained by perspiration. Drawing utensils will always be at your fingertips! Keep them in the Alvin Parallel Straight Edge 48In’s handy, built-in pencil ledge. Weighing less than 3 pounds, the Alvin Parallel Straight Edge 48In dimensions are 53 inches long, 4 inches wide and 2 inches high -- you can easily attach it to your drawing surface. Installation hardware and instructions for mounting the Alvin Parallel Straight Edge 48In onto a solid (but not glass) surface drafting table are included in the package.