Product Details Westcott 12-Inch Transparent Acrylic Ruler- For Accurate Measuring and Drawing Westcott 18" Ruler is made of acrylic for superior quality and has one sided edge in 1/16ths while the other edge in metric. Ruler features beveled edges to eliminate smearing and spare length design provides clear start. Durable, transparent acrylic ruler Beveled edges eliminate smearing 18" One edge scaled in sixteenths and the other edge in metric Spare length design provides clear start and end points for more precise measuring English and metric measurements Plumb line at each end serves as a T-square This Westcott 12-inch transparent acrylic ruler enables you to precisely measure items up to a foot or its metric equivalent in length, width, or depth. It also has beveled edges, so you can use it to draw lines or to score anything from paper to paneling. Additional features that make this ruler even more versatile include a plumb line for use as a T-square. Precision Measurement One of the edges of this Westcott 12-inch transparent acrylic ruler is scaled in sixteenths of an inch, and the other side is intended for precise metric measurements. You can see the markings easily against any surface because the ruler is transparent. Extremely Versatile This Westcott 12-inch transparent acrylic ruler serves you well whether you are working with construction materials or with construction paper. Its beveled edges prevent smearing, and they also make drawing and scoring straight lines a snap. You can even use it as a T-square. Special Features In addition to the plumb lines at each end that give it the functions of a T-square, this Westcott 12-inch transparent acrylic ruler features a spare-length design. This gives you clear starting and ending points so you can measure more accurately.