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