Attwood Cleat flush mount 4.5" countersunk SS316 includes backing plate

Flush Cleats 4-1/2"

This cleat recesses flush to the deck for a clean, contemporary look at an affordable price. 
Corrosion-resistant 316 stainless steel construction (patented design). 
Water-resistant cleat recesses into cast body and is captured with lubricated seals. 
An optional drainage receptacle mounts below the cleat to drain off water.

Easy to operate–simply pull up the cleat from its body
Standard four-hole mount
Water-resistant cleat recesses into cast body and is captured with rubber seals and ball detents
Optional plastic drainage receptacle mounts under cleat to drain off water in 3/8" I.D. hose (not included)
Durable–cast stainless steel construction and simple design assures long-life and dependable operation

Easy Installation 

Countersunk model mounted with four #10 screws , 4-1/2"-long; 1/4" screws.
Hole pattern is similar to competitive models
1/8" stamped backing plate, for decks thicker than 1/2", is standard on all models (optional cast backing plate available for thin decks). 
Gasket provides a water seal between cleat and deck
Fasteners not included