18"/46cm- 60"/152cm backlighted(2400)Self-Illuminated Clocks available in 18 to 60 sizes. 72 to 96 see Style 4600. Shown with Type “WS-A hands and Type “AI markings. Available with any of our dial markings and hands, or ones of your own design. UL Listed. On custom order this clock design can be manufactured to fit any size or shape tower opening be it square, rectangular, octagonal, or elliptical.