Professional Rotary Trimmer. Permanent grid & dual rulers. Safety guard & fully-enclosed blades. Transparent guide assures accurate cuts Self-sharpening blade trims up to five sheets at once (based on 20-lb. bond). Easily change to a scored cut without touching a blade. Replacement Head (PRE110RH), sold separately. 8-1/2 x 19 metal base, 1/2" thick. Manufacturer's limited five-year warranty. Shpg. wt. 3 lbs. 18" Cut 8w x 24d .