Adjusts from two to three holes! Simple push-button operation makes punching a breeze. Guides help ensure perfect paper alignment for great results. Extra-large throat accommodates oversized paper. Jam reverse knob clears jams with ease. Chip-drawer has easy view window so you can see when it's time to empty. Metal and plastic. Sheet Capacity: 24; Operating Method: Electric; Number of Holes: 2-3; Hole Diameter: 9/32 in.