The Charles Leonard Plastic Ruler is a must-have tool for any student or professional. This pack of 36 durable plastic rulers features a double beveled edge with a convenient pencil groove, making it easy to draw straight lines and measure accurately. The raised calibrations show 1/16 inches on one edge and millimeters on the other, allowing for precise measurements in both standard and metric units. The holes on the ruler also allow for easy storage in ring binders, keeping your workspace organized and clutter-free. Made of clear plastic, this ruler allows for easy viewing through to the page, ensuring accurate measurements every time. Recommended age 5+ years