Made up of 304 Grade Stainless Steel, attractive and durable, flared opening, I-beam weld pin base. It is durable, long-lasting, high-quality stainless steel with water resistance, suitable for boats, marines, yachts, and caravans, and commonly used as deck hardware in highly corrosive marine environments. It’s very easy to Install, the holder fits most size rails, and clip-on installation is quick and easy, the mounting hole is specially designed and it is very convenient to use a special screwdriver to adjust the angle of the rod holder from the mounting hole without removing the holder. Dimensions: fit pipe size: 7/8" to 1 inch; rod holder I.D: 1-5/8 inch. Package Includes Pack of 1 MARINE CITY 304 Grade Stainless Steel Heavy-Duty Strong Clamp-on Adjustable Fishing Rod Holder (Includes form-fitted PVC white liner).