Bomar 15 x 24 Cast Aluminum Hatch. Easy open, from outside and inside, 4-dog system. Flush, watertight, cast aluminum. Above or below deck. These rugged, lightweight, reasonably priced hatches are made of Almag-35, the highest non-corrosive of any known aluminium casting alloy. This alloy meets US Army specs for lighweight armor and aircraft landing gear. The hatches are watertight to a 30' head and have a tensile strength of 44,000 lbs per square inch. All pins, rods, screwss, springs and bolts are 18-8 non-magnetic stainless steel or Almag-35. Description: Oval, Opening: 15x24, Deck Cutout: 17-3/4x26-3/4, Flange: 21-3/4x30-1/2, Extends Below Deck: 9" , Weight: 38lbs.