Can be mounted to vertical or horizontal rails – Adjustable for rails 25mm (1″) to 32mm (1-1/4″) diam. Rubber insert to protect your fishing rod from any wear against the stainless surface. Rod holder can be adjusted to 20 different angles when mounted;Easy to install, mounting bracket includes bolts (allen key included). Stopper slot built into the base of the rod holder to located the rod butt into position;Heavy-duty white vinyl liners.