Ideal for home, school and office. Accurately scaled in 1/16" on one side and millimeters on the other. Ends have extra margins for clear starts and stops and plumb lines to aid in checking right angles. Raised beveled edges. Hang-up hole. Ruler Type: Standard/Metric; Length: 18 in; Standard Scale: 1/16 in; Metric Scale: Centimeters; Millimeters.