Marine Clamshell Smooth Thickness Installation Review

Made of Marine grade Nylon, Excellent seawater corrosion resistance and durable, hold up exposed to salt air on boat. Nylon is a lighter and lower cost solution, Strength and service life are exactly the same as 316 stainless steel. Used for splash proof openings or outside vent of wiring cables, wires, hoses. SMOOTH: The flush screw covers area nice smooth touch. Edge of these clamshells are smooth and thick. SIZE: Approx 2.5" x 2-1/4", Height: 1".