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 Alvin Parallel Straight Edge 42In Rigid phenolic construction with a black satin finish. Mobile straightedge affords frictionless operation through the floating action of the nylon rollers mounted on the blade. The rollers retract at a touch, securing the blade for accurate drawing. Plexiglas edges are elevated to prevent ink smears and steel ball-bearing pulleys provide smooth movement. Comes with all mounting hardware and installation instructions. |  |
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