Ritchie F-50W Explorer Compass - Flush Mount - White [F-50W] Watches-accessories Drum Diameter "D" - 89

Drum Diameter "D" - 89 mm (3 1/2")

stabilized Polyurethane tendon

Pin B: 3/8" (10 mm)

Under arm ventilation zippers

Ritchie F-50W Explorer Compass - Flush Mount - White [F-50W] Watches-accessories Drum Diameter "D" - 89Explorer Compass Features: 2 3 4 (70 mm) Easy to Read Direct Reading Dial Easily Installed, Fits 3. 75 (9. 53 cm) Mounting Hole 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 100% Repairable