Our investment cast stainless steel mushroom cleats are ideal for fresh water or salt water conditions. Although they are manufactured from superior stainless steel, we are able to sell at a price that is equal to or lower then most aluminum Mushroom cleats. No other manufacturer can offer this kind of value. It is necessary to remove the spring and clip for installation which requires a 3/4Ó mounting hole. The cleat is 2Ó in diameter.