It can be mounted to vertical or horizontal rails
Adjustable from 7/8" to 1" diam
With the inner screw removed, the rod holder can twist 360° to clamp onto a railing.
A plastic liner surrounds the outer rim and covers the entire inside of the boat rod holder, the plastic liner prevents metal-on-metal contact between the stainless steel and your fishing rod.
This rod holder has draining holes in the bottom plastic liner that prevent rain water from stay in the rod holder.