Tried and true, Ancor built their Mini Lamps specifically for marine environments. Heavy-duty glass envelopes resist breakage while the nickel-plated brass bases resist corrosion, making them ideal for use on boats. The nickel-plated brass base also ensures a positive point of contact. With rough service” design filaments, Ancor provides hours of reliable burning time. Sold in pairs. Note: The last four digits of the Ancor serial number represent the standard (GE) bulb number.