Westcott - ACM16718 Rotary trimmer features a CarboTitanium blade that's eight times harder than steel to keep its sharp edge for longer. EZ-change, push-button blade release makes changing out dull blades safe and simple. Secure locks at each end of the cutting rail tightly hold onto your paper to ensure straight cuts. Measuring grid in both inch and metric measurements help you keep a straight edge on all your projects for consistent cuts. Trimmer is perfect for cutting up to 10 sheets of 20 lb. paper, cardstock, construction paper, photographs and more.