The PROMASTER SCOUT BALL HEAD operates smoothly, and incorporates the ProMaster dovetail quick release system (arca-swiss compatible) so you can use the included quick release plate, an L Bracket, and a host of other compatible accessories. A single level adjusts the tension of both the ball and the panning control. Degree marks are etched into the base for precise rotation. And a safety mechanism in the quick release system prevents your camera from being accidentally dropped.Height: 3 1/4" / 8.3 mmWeight: 8 3/4 oz / .25 kgBall Diameter: 1 1/16" / 30 mmBase Diameter:Maximum Load:Uses Quick Release Plate #2738