Solid cast aluminum construction Welds to existing lower unit to bring back original performance, handlingand appearance Easy to cut into the shape you need Four sizes Covers most outboard and sterndrive skeg applications T-H Marine RS-4-DP Replacement Skeg - for Mercury V6 Outboards and Mercruiser sterndrives (I/Os) SKU: 3001.5792 UPC: 733572004601