his 057 Magnesium Ball Head from Manfrotto features an integrated RC5 quick release cam lock and a 501PL Quick Release Plate. Compatible quick release plates can removed from the head by pulling the cam lock's spring-loaded lever, which also allows the plate to be instantly reattached. The cam lock also features a safety catch to prevent a compatible quick release plate from accidentally disconnecting. The 057 Magnesium Ball Head with 501PL Quick Release Plate has a load capacity of 33.1 lb and can be attached to tripods or other support systems that feature a 3/8"-16 mount. By loosening the 057's primary locking knob, its ball-and-socket joint can be quickly swiveled, angled, fully tilted, or returned to its upright position. Toward the ball head's base is a secondary locking knob that controls the ability to rotate the head 360Adeg. An additional knob opposite the secondary locking knob can be rotated to apply tension control to the ball-and-socket joint's movements. Finally, a two-position slide-switch at the base of the ball-and-socket joint allows it to be tilted down to either a 90Adeg or a 103Adeg angle before it is locked into place using the primary locking knob. The ability to tilt the ball-and-socket joint down to angle beyond 90Adeg can be used to quickly level a camera placed on this 057 Magnesium Ball Head without having to adjust the tripod the ball head is connected to. Cameras or accessories that are compatible with a 1/4"-20 or 3/16"-20 mount can be connected to the 501PL Quick Release Plate which measures 2.0 x 3.5 x 0.4" and has a rubberized, non-slip surface. Head Type Ball Head Base Mount 3/8"-16 Thread Camera Mounting Screw 1/4"-20 Male, 3/8"-16 Male Quick Release Plate Type Q5 Load Capacity 33.1 lb / 15.01 kg Number of Bubble Level(s) 3 Friction Control Yes Independent Pan Lock Yes Material Magnesium Pan & Tilt Range Lateral Tilt -103Adeg to +40Adeg Vertical Tilt -40Adeg to +40Adeg Panning Range 360Adeg Physical Ball Sphere Diameter 2.56" / 65.0 mm Dimensions H: 5.8 x W: 3.1" / H: 147.3 x W: 80.0 mm Weight 57.6 oz / 1.63 kg