MG Duff ZD787B straight shaped zinc sacrificial hull anode, bolt-on, suitable for use in salt waters. Sacrificial anodes should be fitted and correctly bonded to all boats / vessels to help prevent corrosion by cathodic protection when in the water. Comes with backing cushion, nuts and locking washers.  Nominal Weight: 4.0kg - Fixing Type: Bolt on - Bolt Size: 10mm (M10) - Bolt Centres: 200mm (8") - Anode Length: 305mm - Anode Width: 76mm - Anode Height: 32mm