In the metalworking field, a divider caliper, popularly called a compass, is used in the process of marking out locations. The points are sharpened so that they act as scribers, one leg can then be placed in the dimple created by a center or prick punch and the other leg pivoted so that it scribes a line on the work piece's surface, thus forming an arc or circle.A divider caliper is also used to measure a distance between two points on a map. The two caliper's ends are brought to the two points whose distance is being measured. The caliper's opening is then either measured on a separate ruler or then converted to the actual distance, or it is measured directly on a scale drawn on the map.Wing CompassFEATURESFulcrum stud is hardenedBearing surfaces of the legs are large enough to prevent side deflectionBow spring is strong and flexibleAdjustment is centrally located in the legs to assure smooth actionRound legs and solid nut SPECIFICATION 8? 200mm Divider Caliper Wing Compass Metal Marking Circles Machinist Wood SIZE: 8" 200mm Compass a drawing instrument used for drawing circles and arcs. Wing Compass a compass, often large, for scribing arcs and circles, with an arced wing that helps to steady the legs in use, and with a locking screw on the arc to hold the legs firmly in position. Divider a drawing instrument similar to a compass but with two points, Used for dividing lines and stepping off distances.