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 32 different angles when mounted;Easy to install, mounting bracket includes bolts (allen key not included). Stopper slot built into the base of the rod holder to located the rod butt into position;