Universal Deck Mount Hinge - Black is made of Delrin Acetyl Resin Compound with a stainless steel machine screw to except a Socket End. Swivels more than 90 degrees to adjust to any deck angle. It eliminates the need for wedges or several types of deck hinges and can be mounted on the deck or side panel of the boat.Delrin has excellent resistance to corrosion of any kind and is unaffected by water exposure. Colour is cast in, not coated on which means that it hides scratches well and are self lubricating to a degree. These fittings are injection moulded under high pressure to give excellent tolerances in a lightweight, economical product design for durability and performance.