Abstract: A miter guide for guiding a work piece along the cutting path of a saw blade or another working tool. The miter guide includes a guide bar which fits in a slot in the surface of a table, a fence for supporting the work piece, and a telescoping extension arm connected between the fence and the guide bar for fixing the position of the fence at a predetermined angle with respect to the plane of the saw blade. The fence is pivotally connected to the guide bar, and the telescoping extension arm is also pivotally connected to the guide bar, as well as being pivotally connected to the fence at an end of the fence remote from the guide bar. A broad based triangle is formed by the guide bar, the fence and the extension arm. The extension arm includes a rod that is slidably received in a tube, and a knob that is turned to push a deformable portion of the tube against the rod to fix a length of the extension arm, thereby setting the angle of the fence.