Yoke mount with clamp, standard 1" double socket arm and diamond base with 1" ball. Material: Powder Coated Marine Grade Aluminium Ball Size: 1" Rubber Ball "B" Size Components RAM-B-201 RAM-B-238 RAM-B-121B TIP: The small footprint of a RAM diamond base makes this type of mount suitable for use in aircraft cockpits, like Cessnas and Pipers, where space is at a premium.