Abstract: A machine or apparatus is provided for automatically inserting a corner key or angle member in an opening in each end of a lineal member or shape, especially an aluminum extrusion for joining mitered corners of a window together. The apparatus comprises a frame, shape or lineal member feed means mounted on the frame for positioning and feeding a lineal shape or member to a location for receiving a corner key, one or more key feed means for positioning and inserting a corner key into one or both ends of the shape or lineal member, and means for operating the lineal member feed means and the key feed means in a desired sequence.