Made of high quality 316 stainless steel precision casting, corrosion resistance, no rust, strong and durable. Can be mounted to vertical or horizontal rails - Adjustable for rails 19mm to 25mm diam. Rubber insert to protect your fishing rod from any wear against the stainless surface. Rod holder can be adjusted to 30 different angles when mounted,easy to install. Stopper slot built into the base of the rod holder to located the rod butt into position.