Pins on the base lock these bulbs into sockets to withstand vibration.

Pins on the base lock these bulbs into sockets to withstand vibration. They're often used in machines and elevators.

These bulbs are small, but very bright, so they're often used in flashlights and optical instruments such as projectors and microscopes.

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

Use these bulbs in tight spaces, such as in indicators and vehicle lights.

These bulbs are sized to fit tight spaces such as indicators and vehicle lights.

Pins on either side of the base lock these bulbs into sockets.