This is the Lower Vent Window Post Channel for 1933-1960 Chevrolet Passenger Cars. This channel has no beading because it is down inside the door and is not seen. The channel is 1/2" deep x 1/2" wide x 15" long. It is designed to drop into the original vent window post and be riveted or glued in place. NOTE: 1940 Models may have a narrow channel that will not accept this replacement piece. If so, contact us and we can send CV-73, which is slightly narrower.