SeaLux Marine Tapered Clamp-On Adjustable Rail Mount Rocket Launcher Rod Holder fit 7/8"-1" rail (S) SeaLux Marine Tapered Clamp-On Adjustable Rail Mount Rod Holder/Rock Launcher Allow fully 360 degree rotation adjustment within 32 angles. Can be mounted to vertical or horizontal rails - Adjustable for rails 21mm (7/8") to 25mm (1") diam White PVC Liner insert for additional protection of your fishing rod from any wear against the stainless surface Rod Butt Holding 9-1/2" insert, Rod Stopper Pin built into the base of the rod holder to located the rod butt into position;