Rotary trimmer with a 51" cut length features a durable, self-sharpening blade to help you precisely trim thicker material. Automatic clamping system provides even pressure to prevent your work from shifting. Base contains carefully screened guides to help align your cuts. Guides indicate inch and metric measurements for all your trimming needs. Blade's precision-graduated edge will remove even the tiniest sliver of paper and produce a clean, burr-free cut. Sturdy metal base provides a solid foundation that will never warp or crack. Rotary trimmer is designed to cut up to 20 sheets at a time.