Quick view The Joy Factory Carbon Fiber Single Arm w/ 26mm Ball Joint and 20mm Ball Joint Support (70mm) by The Joy Factory Product Information Single arm for mount bases compatible with 1" spherical ball joints This mount arm works with all mount bases that are compatible with a 1" spherical ball joint. This single arm measures 6" long and has a 1" spherical ball joint... MSRP: Was: Now: $69.99 Add to Cart Compare