Sea Dog Horn Ribbed Pinned Oar Lock This horn ribbed pinned oar lock makes an excellent choice for aluminum vessels because it will not cause a catalytic corrosion. Recommended for freshwater use, this oarlock is ideal for light service duty. With die cast zinc chrome plated construction, the ribbed pinned oar lock ensures maximum durability. Features Die Cast Zinc Chromed Plated Ideal For Light Service Duty Corrosion Resistant Excellent Choice For Aluminum Vessels Recommended For Freshwater Use