Ritchie F-50 Outdoor Mounting Hole Explorer Marine Compass Flush Mount Black Easily Installed, Fits 3.75 Deg (9.53 cm) Mounting Hole. Internal Green Night Illumination. Built-in Compensators to Easily Adjust for Deviation. Scientifically Matched Sapphire Jewel and Hardened Steel Pivot Dial Movement. Powerful Directive Force Magnets for Fast Heading Lock-on. Movable Sun Shield. High Temperature Composite Construction for Extended Operating Range. 100 Percentage Repairable. Exclusive 5-Year Ritchie Warranty Approx. Shipping Weight 1 lb (454g). Protective Cover E-50-C. Replacement Parts. Light Assembly 12 Volt EX-0005-2 6 Volt EX-0099-2.