RAM® Double Ball Mount with Two 3/8"-16 Threaded Studs 4K Plus with Case The RAM-B-121U-A-238 consists of a

The RAM-B-121U-A-238 consists of a yoke clamp base

The yoke clamp base will fit rails from 0

The RAM-301-DU consists of the RAM-TUBE™ 2000 fishing rod holder

5" diameter round base with 1

RAM® Double Ball Mount with Two 3/8"-16 Threaded Studs 4K Plus with Case The RAM-B-121U-A-238 consists of aThe RAM B 103 236U A consists of a short double socket arm and two 1" ball bases with a 3 8" 16 threaded post. Designed into the mount is a 1" diameter patented rubber ball and socket system with adjustment points at both ends of the socket arm; this with a twist of the arm knob allows for you to maneuver the mount to your optimum viewing position.