A reduced glare globe preserves night vision while under way. Adjustability of the globe allows for proper horizontal alignment regardless of base configuration. Black Polymer Top with Clear Fluted Lens 3/4 Inch Diameter Anodized Aluminum Tube 2 Collars - Threaded and Locking 2 Screw Positions Wide 40 Adjustable Head Gold Plated Contacts Long Life Vibration Resistance Low Power Drain Improved Corrosion Resistance Low Operating TemperatureTechnical Information: Head: 40 Adjustable LED: 12 Volt Pole: 3/4" Diameter Anodized Aluminum Tube