Acco International Inc. Swingline 3 Hole Punch Acco Portable 3 Hole Punch lets you enjoy wherever-you-go portability and quick, easy use. The high quality metal punch heads provide crisp, clean 9/32 Inch punch holes in up to 3 sheets of 20 pound paper at a time. A convenient straight-edge ruler and built-in paper guide offer precise control and measuring. The Swingline A7074042R is small enough to fit in any 3 ring binder with the built in binder holes, yet versatile enough to suit the needs of students and workers on the go. Swingline, a leading brand in workspace tools for the business, home and mobile office for over 80 years continues to introduce new staplers, sharpeners, punches and trimmers that solve common workplace frustrations and increase productivity. With unmatched quality, durability and performance, Swingline products are truly designed for the way you work!