Rudder AnodeMaterial: ZincOuter Diameter: 6-1/2″Height: 0.87″Weight: 8.79lbsFull size and weight Rudder Each includes Stainless Steel hex nut and socket cap screwThe captive hex nut is a great feature for underwater installations Specifications:Material: ZincBox Dimensions: 3″H x 7″W x 7″L WT: 8.8 lbsUPC: 8033837069973Quick Guide (pdf)Owner’s Manual (pdf)