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

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

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

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

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

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

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

Replace bayonet base incandescent bulbs in exit signs with longer-lasting, energy-efficient LEDs.