X-21BB RitchieSport Compass Features. 2" (5.08 cm) Direct Reading Dial. Easily Installed, Fits Standard 2 1/16" Instrument Hole. View Adusts up to 30 degrees. Scientifically Matched Sapphire Jewel & Hardened Steel Pivot Dial Movement. Exclusive Built-in Green NiteVu Lighting. High Temperature Composite Construction for Extended Operating Range. DirectiveForce Magnets. Exclusive 5-Year Ritchie Warranty.