DESCRIPTION: 2 3/4" Easy to Read Direct Reading Dial; Viewing is adjustable to 30 degrees; 12V Night Illumination; Built-in Compensators to Easily Adjust for Deviation; Easily Installed, Fits 3" (7.62 cm) Mounting Hole.; Scientifically Matched Sapphire Jewel & Hardened Steel Pivot Dial Movement; Powerful DirectiveForce Magnets for Fast Heading Lock-on; High Temperature Composite Construction for Extended Operating Range. FEATURES: Card Graduations: 5.0 Degrees; Compensators: Integral; Back lighting: 12 Volt Dc; Body colour: Black; Card colour: Blue; Card style: Conical; Card size: 70mm. DIMENSIONS: Height: 50mm; Width: 94mm; Panel Hole: 74mm; Depth below Panel: 44mm.