RAM® Yoke Clamp Base with Ball and 1/4"-20 Threaded Hole

The RAM-B-121BAU, yoke clamp mount with 1/4"-20 thread, will fit rails from 0.625" (15.9 mm) to 1.25" (31.8 mm) in diameter. The 1" (25.4 mm) rubber ball is set at a right angle to the plane of the mount, so when connected to a rail, the ball sits parallel to the rail.