It is made up of 316-grade stainless steel with maximum corrosion resistance and durability in the saltwater environment. It is durable and long lasting, high polished surface for a mirror-like appearance and to match modern watercraft, boats, yachts, marines, and so on, works best where there are foam or rubber weather seals around doors or hatch covers. Dimensions: Diameter: 58mm, Thickness: 4.6mm, Bottom Hole: 4.3mm. It is easy to install and can be used on a marine boat, access doors, bait well lids, hatches, center console doors, tackle units, drawer units, and so on. Package Includes Pack of 1 Marine City 316 grade stainless steel boat deck hatch latch door catch with twist action.