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

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

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

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

Often used in task lights, these two-pin wedge base bulbs are comparable to PL, Dulux, and Biax bulbs.

Use these as replacement bulbs in stack lights.