For professional video applications, the Sirui BCH-30 Video Head is based off a 100mm ball mount for use on compatible tripod legs or other accessories such as sliders and jibs. Friction adjustment can be applied in 7 steps, with the 0 setting providing nearly-frictionless movement. A 13-step adjustable counterbalance can compensate for cameras weighing up to 39 pounds. 7 levels of friction control for panning and tilting, with 0 position for near-frictionless operation 13 levels of counterbalance adjustment Dual bubble levels: Illuminated base bubble level and second top bubble level Dual Safety Lock Quick Release Platform: Prevents the camera from sliding off the head while aligning for proper balance Calibrated Quick Release Platform: Easily reposition your equipment using the etched scale on the platform Dual telescoping handles Extra 1/4" and 1/8" screws stored in the integrated threads Integrated 100mm ball mount Separate pan and tilt-lock knobs Quick-release plate included