A vertical strip on each jamb that separates the sash of a double-hung window.
Small wood piece used in the side and head jambs of double-hung windows to separate upper and lower sash
A narrow moulding, either integral or applied, that holds a sash or panel in position in a frame.
The portion of a window or sliding patio door that is screwed into a recessed channel to help provide better support for the sash or door panels.