The Manfrotto 425B Mega Boom is the largest boom in the Manfrotto line. Movements including pan, tilt and rotation, as well as the telescopic extension of the boom arm, are controlled by smooth-operating geared crank handles. This two-section Mega Boom has a 12' (3.6m) maximum extension. It has dual receptors -- Junior (1-1/8") and Baby (5/8").