Rib – loc miniature panel indicator lites are low cost and simple to install from the front of the panel.
No mounting hardware is required. Their unique black polyamide molded “ribbed” case allows them to fit firmly when pressed into 0.312” punched holes. This along with a wide selection durable polycarbonate lenses in six colors (in both flush and flat top configurations) as well as Incandescent,  Led and Neon lamp versions, makes these units a perfect choice for most any application where economy appearance and ease of installation are prime considerations.