This is a sturdy aluminum lens cell for a 6 inch diameter telescope lens assembly. There is NO lens included with this lens cell.
This lens cell has a removable dew shield which is about 4 inches long. This will accept lenses of 6.118 inch diameter. There is a spacer ring which is 0.124 inches thick. The maximum edge thickness of the lenses is 1.5 inches or 38mm if used without the spacer ring. The minumum edge thickness is about 28mm without the spacer ring, or 24mm with the spacer ring.
This is a thick, heavy duty lens cell which should give you a lifetime of excellent performance for that refractor telescope you have always been planning to make. I don't need this lens cell anymore. Asking $50.00 plus shipping/