The choice for the most demanding trimming projects. Patented CARL locking rail mechanism holds paper and paperboards firmly in place while premium carbide blades ensure a precise, accurate cut. Adjustable magnetic paper guide holds materials on a calibrated sturdy metal base. Great for repetitive cuts. Features also include handy storage compartment for extra blades and cutting mats. Trims up to 30 sheets of standard copy paper. Also cuts cardstock, artist black-core matboard, 1/8 inch foamboard and plastic sheets. Limited lifetime warranty (excluding cutting blades and cutting mats).