The Rotatrim Medium-Duty Trimmer is designed for high quality performance in the studio, classroom or office. A self-sharpening tungsten steel cutting wheel and flat counter blade produce a clean, precise cut every time. Blade cuts in both directions and a transparent clamp strip holds material firmly in place while cutting. The aluminum slide rule is calibrated in inches and metric units, with an adjustable cursor for repeat cuts. The baseboard is made of gray, wipe-clean Melamine, 7/8 inch thick x 12 inches wide. The printed grid includes inch and metric measurements, with 1/4 inch grid lines.