From Staples.com: "Punch easier - perfect for any office worker's desktop. Get powerful 20-sheet capacity from a 3-hole, low-force punch. This SmartTouch? manual punch also features a soft-grip handle that adds comfort and locks down for storage. Hole pattern in punch base keeps the chip tray viewable. When full, the paper chips tray can be quickly removed through a back door opening or fully cleared by removing the bottom of the punch. Aligning sheets in the 3-hole punch is simplified thanks to the built-in ruler and edge guide. Great for regular use in the office, the punch also features durable metal construction for long-lasting use. SmartTouch 3-hole punch, low force 20 sheet paper punch capacity 9/32" punch hole diameter Features a built-in ruler and edge guide for punch alignment Black/Gray Soft grip handle helps improve comfort of manual hole punching 12.2x2.6x4.7 (IN) Limited 1 year warranty Manual SmartTouch reduced effort 3-hole punch with reduced effort design makes punching 60% easier than traditional hole punches Hole pattern in punch base allows user to see when chip tray is full Durable metal construction Chip tray has a flip open feature for easy disposal of paper chips Handle locks into a closed position for compact storage"