Aluminum Anode For Volvo Penta 200-280 Outdrive Bar Replaces 832598A Length: 7-1/4" Width: 1-1/4" Height: 3/4" Hole Distance: 5-3/4" center-to-center Hole Diameter: 3/8" Weight: 0.75 lbs This Is A US Military Grade Magnesium Anode. Magnesium Is For Freshwater Use.