RAM Double Ball Yoke Clamp Mount with Angled Extension Plate (RAM-B-125U-A) (sku 54846)The RAM B 125U A consists of a yoke clamp base, SHORT length double socket arm and angled extension plate that contains the universal AMPs hole pattern. The yoke clamp base will fit rails in diameter from 0. 625" to a maximum of 1. 25". The 1" rubber ball is at a right angle to the plane of the mount; when connected to a rail, the ball sits parallel to the rail. Originally designed to position your GPS in front of the yoke on your plane, the angled