Description: brand new and high quality Feature: Made of high-quality material, durable, firm and stable for us to use. With a small shape and compact size, it is easy and convenient for us to take and carry. Adapter can be used on pedestal base or for head. for Arkon Robust Mounts, and other 25mm ball pattern mounts. Converts heavy-duty 25mm smartphone or tablet mounting pedestal to a 4-Hole AMPS pattern. The 4-Hole AMPS pattern consists of four holes in rectangular pattern. Ball for Head Mounting Adapter only, other accessories demo in the picture is not included! Specifications: Item Type: Ball for Head Mounting Adapter Material: Rubber Height: 55mm/2.1in Ball Diameter: 25mm/0.9in Color: Black Quantity: 1 Pc Note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x Ball for Head Mounting Adapter