Explorer Compass B-51, B-51G e B51W: 2 3/4" Easy to Read Direct Reading Dial, Adjustable and Removable with Bracket and Thumbscrews, Internal Green Night Illumination, Built-in Compensators to Easily Adjust for Deviation, Scientifically Matched Sapphire Jewel & Hardened Steel Pivot Dial Movement, Powerful DirectiveForce Magnets for Fast Heading Lock-on, Movable Sun Shield, High Temperature Composite Construction for Extended Operating Range. Approx. Shipping Weight: 1 lb. Black - bracket 80mm x h 119mm x w 100 mm.