The Leofoto LH-55 Low Profile Ball Head (Black) is a 55mm ball head that will support large camera/long lens combinations weighing up to 55 lb. Crafted from aircraft grade aluminum and hard anodized, the LH-55 has all of the qualities you would expect from a professional-level head. An over-sized, ergonomic locking knob allows 45-degree tilting in all directions and dual 90-degree drop-notches facilitate 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.