Dahle Stack Cutter is manually operated but make easy cutting of up to 500 sheets of paper at a time. Safety shields can be found on either side of the cutting blade and will not allow the blade to move while they are in the up position. Once the shields are in place, you have the ability to cut cleanly though 500 sheets of paper with very little effort. This clean, burr free cut through such a large stack of paper is made possible through a ground Solingen Steel blade and a paper clamp that places even pressure across the entire cutting surface. The two larger machines offer a self-locking spindle driven backstop for minute adjustments to your cutting measurements. These cutters can be mounted on any secure table surface recommended for proper cutting.