An important must tool for the pocket of any engineer Measuring, & Marking pocket ruler cum gauge which serves 5 distinct functions of a Center Finder, Bevel protector, a 4-3/4" Ruler with 1/64" graduations, 9.8 mm Ruler with 1 mm graduations, a circle divider & a Drill point gauge for checking 59 degree drill points. Etched stainless steel body includes a tap drill reference chart.