12 plastic ruler features a double-bevel design for quick simple measurements on either end. Its easy-to-read graduations and numerals are sharply defined to help prevent reading errors. Holes down the center allow easy storage in a three-ring binder (sold separately) for quick access when needed. Environmentally friendly construction offers a sustainable way to minimize its global impact. Westcott Recycled Double Bevel Plastic Ruler Clear 1 Each (Quantity)