From the Manufacturer:
The 526 Professional Fluid Video Head directly addresses the heavy-duty, high-end ENG and EFP video market by offering a feature-packed fluid video head that borrows all the combined benefits of our 500 series heads with the ability to support top weight loads over 15lbs. The 526 features a replaceable and removable pan arm rosette so if any damage occurs to the side castings, only a small part needs to be replaced; large rubber padded knobs for better grip and all the controls (tilt and pan lock, tilt drag) are located on the left side so they can be easily found. The 526 offers our most precise fluid drag system comprised of three step settings for low, medium and high drag levels (numbered 1, 2 and 3), plus the additional no-drag setting (number 0) for such occasions as snap-pans/tilts. Counterbalance is achieved through an adjustable spring for camera weights between 17.5 and 33 lbs. The built-in 4-inch half-ball adapts to a number of our tripods with a 4-inch receiver, allowing the quick leveling of the camera with the aid of the bright leveling bubble. The 526 comes with one pan arm and the long 357PLV plate. The Manfrotto 545B is a two stage, twin leg, lightweight aluminum professional video tripod. Due to optimization of the upper and lower collars, the tripod guarantees more torsion rigidity and payload (55 lbs.), plus improved shooting performance. The collars have also been redesigned to be aligned with the single tube tripods. The die cast aluminum crown features a built-in 100mm interface bowl, which can be adapted to a 75mm if needed. The tripod is equipped with an innovative mid-level spreader for improved tripod stability. It comes with quick on-off rubber shoes for better grip on smooth floors. Highlighted Features: Built-in 10mm interface bowl, can be adapted to a 75mm if needed Spreader length regulation.