Manfrotto 526 is a professional-grade fluid video head with a 100mm half-ball base, designed for heavy-duty ENG/EFP setups supporting camera rigs up to 35 lbs (16 kg), featuring continuous counterbalance (17.6-33 lbs/8-15 kg at 125mm C.O.G.), 3-step plus zero fluid drag on pan/tilt, and left-side controls.