Selling a Really Right Stuff (RRS) BH-55 Ball Head with full size Hejnar pro arca-swiss compatible clamp. This is the strongest, best ball head you can get, supporting camera packages up to 55 pounds. Movements are precise and easy, with the ability to dial in the perfect amount of resistance on the ball, and no drooping once it's locked down, even with large lenses. Your camera and lenses may come and go, but your tripod and head can last a lifetime; this one certainly will. Made in the USA.
In perfect condition. Comes with box and carrying bag.
Asking $310, priced lower than any equivalent used one I could find.
Sells new for $520 plus tax: https://www.bhphotovideo.com/c/product/1301057-REG/really_right_stuff_bh_55_pro_bh_55_ballhead_with_full_size.html
Description:
The BH-55 Ball Head with Full Size Screw-Knob Clamp from Really Right Stuff is a 1.9 lb ball head that will support large camera/long lens combinations weighing up to 50 lb. Crafted from aluminum and stainless steel, the BH-55 has all of the features you'd 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.
Benefits
Ergonomic design gives superior handling and unsurpassed reliability
Lowest height profile in its class
Knobs are captive and uniquely shaped, making operation by feel very intuitive
Dual 90-degree drop-notches allow 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 and features unique drum and brake design for effortless locking
Laser-engraved millimeter scale offers precise centering and positioning within the clamp jaw
All components are machined from solid aircraft aluminum or stainless steel for maximum durability and minimum weight