GZ01240 | Groz Multi-Use Rule & Gauge 100mm Can be used as:. A Drill Point Gauge for checking 59° angle drill points. A Protractor for measuring and laying out angles. A Centre Finder for locating centres on shafts and circles. A Circle Divider for dividing circles into sectors polygons and polygrams (up to nine equal parts). Tap and Drill Table shows popular tap sizes and corresponding drills sizes for American National threads. Manufactured from stainless steel this multi use tool comes complete with a 100mm (4) rule with permanently etched graduations in millimeters and 64th.