Explorer V-57 e V-57W Compass: 2 3/4" Direct Reading Dial, Easily Installed, Fits 3" Instrument Hole, Bezels Styled to Match Popular Gauge Packages, Adjustable 45? to Match Dash Angles, Choice of Traditional Black or Designer White Colors, Scientifically Matched Sapphire Jewel & Hardened Steel Pivot Dial Movement, Exclusive Built-in NiteVu Lighting, Built-in Compensators to Easily Adjust for Deviation, Hi-Temperature Construction, 100% Repairable, Approx. Shipping Weight: 1 lb. All magnetic compasses come standard with 12 volt lighting. Black - external diameter 86 mm.