Professional rotary trimmer with 18" blade is ideal for a variety of office functions as well as school, arts and crafts projects. Patented Carl rails and premium carbide blades hold paper and paperboards firmly in place and cut more precisely. Trimmer has a sturdy, metal calibrated base for accuracy and added stability and features preset measurements for common-sized items. Use trimmer to cut mat board, cardstock, plastic sheets, and more. Blade cuts up to 10 sheets of standard copy paper. Use optional B-Series blades (not included) for 11 different cutting patterns.