The Michigan Wheel aft castle was designed exclusively for Mercury Mercruiser V6 outboards. The Michigan Wheel Aft Castle Washer supports the steering post structurally, eliminating sag and improving boat control. This unit's huge footpad surface increases performance by providing better grip in choppy water and decreasing steering shaft stress. Key features: Mercury V6 outboard engine aft castle washer The aft castle washer is made of induction-hardened stainless steel and minimizes wear on the crankshaft and camshaft bearings. To increase durability and minimize the chance of cracking or scratching, the surface is hot-pressed. Specifications: SKU: 990348 UPC: 014984020183 Weight: 0.30 LBS Manufacturer Part Number (MPN): 990348 Item Package Dimensions (L x W x H): ?12 x 10 x 1 inches Brand Name:Michigan Wheel Color: ?Bronze Manufacturer: ?Michigan Wheel Brand: Michigan Wheel Manufacturer Part Number: ?990348