Professional Rolling Trimmer-28 1/4"Features Blade is encased in carriage mechanism, eliminating the chance of injury. Chrome guide bar and rotary action allows cutting in both directions. Self sharpening blade produces clean, burr free cuts. Cuts up to 20 sheets, and accommodates small poster paper up to 28 1 4". Paper clamp keeps materials from shifting. Adjustable paper stop ensures consistent cutting. Metal base provides stability, and has preprinted guide lines for convenience.