Abstract: An elongated hollow miter box embodying spaced-apart top and bottom walls has its ends bevelled on a 45.degree. bias. A pair of fixed guide edges on the top wall of the box are parallel to the bevelled ends and serve to guide the usual slide shoe of a portable electric saw over the top wall to effect a 45.degree. cut through either end of a wooden molding or other strip which is positioned and held on the bottom wall of the box. Near one end of the box, a transverse cross cut in the top wall cooperates with an auxiliary guide piece which, when placed on the top wall, presents an edge which guides the saw shoe transversely over the top wall and enables a 90.degree. cut to be made in the wooden strip. An opening in the medial region of the top wall affords finger access to the molding or other wooden strip for steadying purposes during making either a 45.degree. or a 90.degree. cut.