Abstract: This mitering device comprises: a unit composed of a slotted panel slidably mountable on a saw table for longitudinally-guided stock-mitering and return movements and a pair of panel-mounted left and right abutments cooperatively presenting front edges which converge forwardly at 45.degree. toward the panel slot and at 90.degree. toward each other and which terminate adjacent the panel slot; and length-measuring stop means including means calibrating the front edge of the right abutment from a zero reference point, where a projection of the front edge intersects the saw plane, and a mitered stop member mounted for adjustment along the right abutment to a selected calibrated position wherein its miter mates with the mitered right end of the stock to set the length of the perimetric surface of the rabbet to a precisely measured value approximating a given mat length plus a desired tolerance.

Abstract: In the art of making mitered frame members on a work table associated with an operatively mounted mitering saw, an improved device for use in mitering rabbeted metal type and wood type stocks, comprising: (A) a portable panel having a forwardly-rearwardly extending slot to receive the mitering saw; (B) a panel-mounted abutment means including, (1) for metal stock, a rear abutment wall extending on and along the rear side of a vertical plane which converges forwardly toward the panel slot at an angle of about 45.degree. on the rear side of said plane, and, (2) for wood stock, a front abutment edge extending on and along the front side of a parallel vertical plane, which converges forwardly toward the panel slot at an angle of about 135.degree.