RAM Mount Strap Mount w/Arm & Round Base [RAM-B-108U]RAM Mount Strap Mount w Arm & Round Base The RAM B 108U consists of a 1" diameter rubber ball connected at a right angle to a v shaped base, double socket arm and 2. 5" base that contains the universal AMPs hole pattern. The base will accomodate rails from 1. 0" to a maximum of 2. 1" in diameter. The mount is designed with a RAM 1" diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; this