Alvin and Mayline Parallel Rules. MAYLINE Mobile Parallel Ruling Straightedges. Perfect for engineering and construction applications The industry standard. Alvin 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.
Alvin 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.
The Martin Pro-draft Professional Parallel Straightedge is cutting edge technology. A short list of the Pro-Draft's features include: Aluminum body for strength and stability, Anti-warp cast acrylic bottom with ink edges, locking devicto lock in any angle that you would like to draw, and anti-static rollers to avoid smudges to your drawing.