RAM Yoke Clamp Mount with Double Socket Arm and Round Base Adapter The RAM-B-121-202U consists of a double socket arm round 2.5" base that contains the universal AMPs hole pattern and yoke clamp base. The clamp base will acmodate rails in diameter from 0.625" to 1.25". The 1" rubber ball is at a right angle to the plane of the mount so when connected to a rail the ball sits parallel to the rail. This mount is designed to be a universal mounting solution for both RAM and non-RAM designed products. Material:Powder Coated Marine Grade Aluminum Ball Size: 1" Rubber Ball "B" Size Note:The "U" in the part number reflects product packaged in poly bag. Product : RAM MOUNT YOKE CLAMP MOUNT W/ DOUBLE SOCKET ARM ROUND BASE Manufacturer : RAM MOUNT Manufacturer Part No : RAM-B-121-202U UPC : 793442902741