The 64S9 is a square lens set designed for 16mm Command Series pilot light indicators manufactured by TE Connectivity/Alcoswitch. This lens set includes a button, diffuser, and cap that snap into place on both oiltight and non-oiltight indicator models. The square lens configuration matches the appearance of Command Series pushbuttons and allows for easy insertion of legends. The 64S9 operates over a temperature range of 4°F to +122°F (-20°C to +50°C) and features an insulation resistance of 100 Megohms minimum with a dielectric strength of 1,500 VAC. These lens sets are commonly used in industrial control panels and instrumentation applications where visual status indication is required, offering reliable performance in NEMA 1, 12, and 13 environments.