This Triple Latch Marine Deck Hatch features 3 locking points which when engaged cause the camming surface to pull the lid into the gasket creating a water tight seal. Constructed of injection molded polypropylene with a structural honeycomb lid for superior rigidity and strength. Non-slip textured surface. Can be mounted horizontally or vertically. Full length piano hinge for added strength and security. Interior opening is 11-1/8″ X 7″ and will accept group 24 series size batteries. Installs with ten #10 FH fasteners (not included).