 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 device to lock in any angle that you would like to draw, and anti-static rollers to avoid smudges to your drawing. Size 36 inch Includes the cable and all mounting hardware needed to mount onto a drafting table. Suggestion for buying parallel straightedges: Always buy to a size that will extend over your common drawing size, however, try to buy 6 inches shorter than the length of your table top. This will allow space for you reference materials. For example, a 31.5x48" top with a 42" Pro-draft. | 
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