Inside the 501HDV is a powerful new feature that takes its inspiration from our top professional video head models – a fixed counterbalance spring (set for a typical weight of camera + accessories of 2.5kg) that helps ensure both smoother tilt movements and greater equipment safety even when tilt locks are inadvertently left off. The easy- to- reach on/off switch allows the counterbalance system to be disengaged or re- engaged for different filming setups. But from the outside, the first thing that you’ll notice about the new 501HDV video head is its updated design – completely retuned for much improved ergonomics with locks and knobs that allow a more solid grip and better fingertip control. The 501HDV inherits its separate pan and tilt locks, gradual tilt friction adjustment system, flat base (with standard 3/8” thread), quick release camera plate and repositionable pan bar from its successful predecessor. This replaces the Manfrotto heads 3063 and 136. Additional pan handle: 501HLV; attachment: 1/4- Inch and 3/8- Inch screws; attachment (bottom): 3/8- Inch female thread; balance control: 2 step: 0Kg - 2.5Kg.; bubble spirit level; color: black; - 60Degree / +90Degree tilt range; independent pan lock; independent tilt lock; load capacity: 13.23 lbs.; material: aluminum; 2 pan bar positions; 1 pan bar included; pan drag: 1 step plus variable PTFE friction; panoramic rotation: 360 Degree; plate type: 501PL; quick release; secondary safety system; sliding travel of plate: 2.28 in.; spring loaded counter balance; tilt drag: 1 step plus variable PTFE friction; weight: 3.53 lbs.; working height: 4.53 in.