Dock Edge Mooring Arm 4' 1500lb SetDock Edge Mooring Arm 4' 1500lb Set An economical alternative or enhancement to bumpers and dock bumper profiles, these Mooring Arms retain your watercraft a safe and convenient distance from the dock face to minimize the possibility of damage from wind, wake, and waves. These easy to install mooring arms apply vector based forces to the bow and stern of the watercraft allowing it to freely and effortlessly follow wave and water action such as tidal