Arca Swiss P0 Threaded Monoball in very good condition with normal signs of use.

Manufacturer's blurb

The Arca-Swiss Monoball P0 Tripod Head with Panning System is a unique knobless tripod head featuring a design that abandons traditional locking knobs and replaces them with a three-elements geared locking system. This system allows the head to be positioned at any angle. The Monoball P0 locking elements apply a uniform force around the ball ensuring smooth camera movements in any axis.

When the camera is placed directly on the ball and not on its neck, the movements are as stable as if they were on a rubber ring. The aspherical ball also prevents sudden camera movements. The panning system is located just below the camera mount, providing a panoramic rotation that remains in line with the vertical.

The Monoball P0 has a tilt ball range of 90°, and 360° panning. It weighs only 280.66 g (9.9 oz) and is supplied with a 1/4"-20 thread adapter and two 3/8"-16 adapter screws to make it compatible with most cameras. It will support equipment up to 20 kg (44.1 lb).