RAM® 18" PVC Pipe Extension with B Size amp; C Size Socket Arms (RAP-CB-201-18U) Features a C-Size ball on one end and a B-Size ball on the other with ability to swivel 360-degrees. KEY FEATURES Overall Length: 18” Ball Size: Size-B and Size-C Made from high-strength composite The RAM® 18" PVC Pipe Extension with B Size amp; C Size Socket Arms (RAP-CB-201-18U) consists of a LONG extension pole and 1" and 1.5" ball single open sockets. The socket ends can swivel 360 degrees, allowing you to rotate your camera adapter, if you choose, in any direction.