A.L.P. Lexalite® The Lindy Model 424 refractor and prismatic top feature a traditional turn-of-the-century shape and cutting edge photometric performance. Assembled refractor bottom and top are 15.9” in diameter, 23.16” high and are available in 8” or 9” diameter fitters. It can be shipped as a one-piece (glued), one per carton or shipped as components with clamp band for field assembly.