This 12V DC solid-state LED diodes never need replacement. The blue colored light provides easy to see indication of circuits that are active. Bright chrome-plated body, bezel, washer and hexnut. Quick connect terminals are polarized for ease of wiring. Mounts into a 9/16" hole, fits panel thickness of 3/16" through 9/32". Compares to Cole Hersee part number PL-612-B-BP.