The RAM 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.
Material: Powder Coated Marine Grade Aluminum
Ball Size: 1" Rubber Ball "B" Size
Made in the USA, and backed by a lifetime warranty, RAM mounting products are some of the best in the industry!