Diameter: 125mm (4.9") Thickness: 21mm (0.8") Hole Diameter: 11mm (0.4") Countersink Diameter: 30mm (1.1") Weight: 1.0kg (2.2 lbs) Streamlined hull anode for Azimut yachts, models AZ39, AZ40, AZ42, AZ46, AZ50, AZ55, AZ62 and others. 30mm diameter countersunk hole for M10 mounting nut.