Bulbs have two filaments, which operate at different brightness levels.

Offset pins on the base lock these bulbs into sockets. One pin is slightly higher on the base than the other pin.

Bulbs have two filaments, which operate at different brightness levels.

These miniature bulbs are sized to fit older telephone switchboards, signs, instruments, and indicators.

These bulbs are sized to fit tight spaces such as signs, control panels, indicators, and flashlights.