The RAM yoke clamp mount for the Apple iPad/2 will fit rails from 0.625" to a maximum of 1.25". The 1" rubber ball is positioned 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 hold the following devices:
Apple iPad/2 Wi-Fi 16GB, 32GB and 64GB
Apple iPad/2 Wi-Fi + 3G 16GB, 32GB and 64GB
High Strength Composite and Powder Coated Marine Grade Aluminum
1" Rubber Ball "B" Size