GRAF Studioball head with Arca clamp, designed for long lenses, medium and large format cameras. Heavy-duty ball head is ideal for photographers who need reliable and stable support. This large 3"-ball model is specifically designed for heavy cameras and the Arca clamp provides a secure grip. Crafted with Swiss-made precision, this head features a durable construction that withstands rigorous use. Adjustable by means of three knobs, one controls tension on the ball, the smaller second one locks it in place, while the third  allows for rotation of the base (any notchiness in the movement disappears once the weight of the camera is attached). Some cosmetic wear as seen in the photos, but works extremely well and should for years.