Westcott Drafting and Drawing Tools are some of the finest products of their kind for students and professionals. The commitment to meticulous quality and cutting edge innovation in measurement and art materials has earned an unparalleled reputation. Feature-packed ruler is ideal for home, school, office and shop. Precisely scaled in 1\/16" on one side and millimeters on the other. Features raised beveled edges to eliminate smearing and extra margins at the ends for clear starts and stops. Plumb lines at ends aid in drawing or checking right angles. Hang-up hole.