The multi use rule and gauge perfroms 5 separate and distinct functions: Drill point gauge, bevel protractor, center finder, circle divider, and tap and drill gauge. The screw gauge is used to identify machine screws, bolts, wood screws, self-tapping screws, and common cotter pin sizes. Circle divider (up to 9 equal parts) is used for dividing circles into sectors, regular polygons, and polygrams. Tap and drill table shows popular tap sizes with correct drill sizes for National form of thread. 1 of our most popular pocket tools performs 5 separate and distinct functions. Drill point gauge is used for checking 59 deg. angle drill points. Bevel protractor is used for measuring and laying out angles. Center finder locates centers of shafts or circles. Made of long-wearing stainless steel. 4" rule has etched graduations in 64th and millimeters.