It is made up of Injection Molded Polypropylene, suitable for marines, ships, yachts, kayaks, and so on. It is a very durable, long-lasting, water-resistant, and high-quality unit with solid cast frames for long-lasting durability. Easy to Install and ready to use, easily mounts to any flat surface, the closed-bottom with drain tail design allows for guided drainage to help protect the inside of your boat. Dimensions: Length 6-7/8”, Inside Diameter:1-5/8”, Install in 2” hole. Package Includes 1 piece of Marine City Black Liner Injection Molded PVC Rod Holder with Cover.