Abstract: An improved combination square set is provided. It has a square head, a center head, a protractor head and a blade. The improvement is the blade which can be a grooved L-square rule, a grooved T-square rule, a grooved try square and a grooved flat straight rule, so that the improved combination square set can be used to measure and mark quadrants on round stock, the angle of a drill press table and angles on a flat board.

Abstract: A quadrant for use by draftsmen; the device consisting of two arms attached pivotally together at one end, and including degree calibration, so the angle between the arms is readily read, and the device including locking means whereby the angle between the arms can be maintained fixed.