Glass Jamb Tubes Glass Jamb Tubes Complete your glass door opening with our vertical jamb tubes. Designed to house locking hardware; jamb tubes also provide support for intermediate headers when the opening exceeds recommended door heights. Solid 1-3/4" x 4" Glass Jamb Tube (HDSJ-1750x4000). Solid 1-3/4" x 4-1/2" Glass Jamb Tube (HDSJ-1750x4500). Solid 2" x 2" Glass Jamb Tube (HDSJ-2000x2000). Solid 2" x 6" Glass Jamb Tube (HDSJ-2000x6000). Two-Piece 1-3/4" x 4" Glass Jamb Tube (HDRJ-1750x4000). Two-Piece 1-3/4" x 4-1/2" Glass Jamb Tube (HDRJ-1750x4500).