Rubber insert to protect your fishing rod from any wear against the stainless surface. Can be mounted to vertical or horizontal rails – Adjustable for rails Rails 1-1/2″ to 1-3/4″diam. Heavy-duty white vinyl liners, Easy to install, mounting bracket includes bolts (allen key included). Rod holder can be adjusted to 20 different angles when mounted, for Rails 1-1/2″ to 1-3/4″. Stopper slot built into the base of the rod holder to located the rod butt into position.