A portable jig used in light frame construction has a rigid body formed from a resilient material that is approximately rectangular in shape with a central planar web with a peripheral, perpendicular flange, and at least three saddles, attached to the central planar web. The jig also possesses a vertical framing flange that extends from one of the saddles and is parallel to the central planar web. The longitudinal axes of at least two of the saddles are parallel to each other and are spaced apart in conformity with standard building code spacing. The longitudinal axis of at least one of the remaining saddles is perpendicular to the aforementioned parallel saddles. These saddles are used to position the vertical framing elements at the desired spacing and at the same time ensure that they perpendicular to the horizontal framing elements.