Swingline Gray 50-Sheet 350MD Electric 3-Hole Punch drills 9/32 holes up to 50-sheets of 20 lb. The ease and convenience of this three-hole electric punch makes operation worry-free. Built-in jam reverse function ensures smooth operation and enhances productivity. Clear window on the punch chip tray lets you know instantly when the hole punch is full. Tray slides out easily for emptying.