The 15.84B is a plastic plate that fits underneath the 15.84 flat eye plate to create a barrier between the stainless steel and the surface it is attached to. 

We've manufacture a wide range of stowage brackets. All are manufactured from electro polished 316 stainless steel for a long, corrosion-free life. The flexible bracket can be used in places where crew may stand on them or where reduction in noise inside the boat is required.