This triple latch hatch features three locking points which, when engaged, cause the camming surface to pull the lid into the gasket creating a water-tight seal. Ideal for dinghy seat hatch, bulkhead hatch or deck hatch in many of our small boats. Constructed of injection molded polypropylene with a structural honeycomb lid for superior rigidity and strength. Non-slip textured surface. It can be mounted horizontally on a seat/deck or vertically on a bulkhead. Full-length piano hinge for added strength and security. Interior opening is 11-1/8"x7", and will accept group 24 series size marine battery. Installs with ten #10 PH fasteners  or #10-24 panhead machine screws, and silicon sealant These item are not included with this hatch.