DESCRIPTION: 4 1/2" Ritchie CombiDial and Built-in Clinometer; Internal Gimbal Systems for Maximum Stability During Adverse Pitch and Roll Conditions; Scientifically Matched Sapphire Jewel and Hardened Steel Pivot Dial Movement; Built-in Compensators to Easily Adjust for Deviation; 45 degree Lubber Lines; Exclusive Built-in Dual 12 Volt NiteVu Lighting; Fiberglass; Reinforced Bowl; Easily Installed, Fits 5.75" (14.61 cm) Mounting Hole; 100% Repairable. FEATURES: Card Graduations: 5.0 Degrees; Compensators: Integral; Back lighting: 12 Volt Dc; Body colour: Black; Card colour: Red; Card style: Conical; Card size: 114mm. DIMENSIONS: Height: 183mm; Width: 183mm; Panel Hole: 146mm; Depth below Panel: 79mm.