The Leofoto LH Series Ballhead is expertly crafted from aluminum and features a robust hard anodized finish. It encompasses all the qualities you&';d demand from a head at the professional level. An over-sized, ergonomic locking knob allows 45-degree tilting in all directions and a 90-degree drop-notch facilitates quick and accurate switching from the horizontal landscape position to vertical portrait orientation. A separate tension knob is provided to apply the appropriate pressure that safely corresponds to the weight of your camera. A third knob loosens and locks the panning base which is laser-engraved with markers every 2.5 degrees from 0 to 360 degrees. Ergonomic design gives superior handling and unsurpassed reliability Lowest height profile in its class Knobs are captive and uniquely shaped, making operation very intuitive 90-Degree drop-notched allows maximum flexibility for positioning the camera for portrait-orientation or extreme angle shots Micrometer drag tension adjustment is repeatable and absolutely reliable Precision panning base is finely laser-engraved at 2.5 degree intervals Laser-engraved millimeter scale offers precise centering and positioning within the clamp jaw All components are machined from solid aircraft aluminum and hard anodized for maximum durability and minimum weight Model Ball Diameter Panning Base Diameter Height Mounting Hole Max Load Weight LH-40 40mm/1.57in 57mm/2.24in 87mm/3.42in UNC3/8"-16 20kg/44lb 491g/1.08lb LH-47 47mm/1.85in 62mm/2.44in 98mm/3.85in UNC3/8"-16 22kg/48lb 625g/1.37lb LH-55 55mm/2.17in 72mm/2.83in 98mm/3.86in UNC3/8"-16 25kg/55.12lb 812g/1.79lb