The Dahle 448s Premium Rolling Trimmer with a 51" cutting length is designed for precision trimming of thicker material. It features a ground self-sharpening blade, an extruded aluminum guide bar for strength, and an automatic clamp to prevent shifting. It includes a space-saving stand to ensure optimal cutting height. This German engineered cutter is ultra-precise and ideal for trimming paper, cardstock, and matboard. SELF-SHARPENING- This trimmer features a self-sharpening cutting system. No need to worry about replacing dull or worn blades, this system sharpens as you cut to maintain a perfectly honed edge. The blade's precision graduated edge will remove even the tiniest sliver of paper and produce a clean, burr-free cut. AUTOMATIC CLAMP- Holding your work securely by hand is no longer necessary. The trimmers integrated, automatic clamping system provides even pressure that prevents your work from shifting. METAL BASE- For durability, this German engineered trimmer features a sturdy metal base. Its a solid foundation that will never warp or crack. ALIGNMENT GUIDES- For measuring, the base contains carefully screened guides to help align your cuts. The guides indicate inch and metric measurements for all your trimming needs. Dahles 448s has a cutting capacity of up to 20 sheets and is a popular choice among professional photographers, print shops, and graphic design agencies.