The measurement is not to describe the length of the entire adapter, while measure the diameter of the ball from top end to another.made of a sturdy composite material, ball joints are coated in a rubber material, the middle is connected by stainless steel.Compatible with all standard and GPS device.Compatible for phone brackets.With the dual ball adjustments, this mount allows you to have the flexibility of rotating your device 360 degrees.Delivery Quantity: 1pcPackage Contents: Only the above package contents, excluding other products.Size: 6.38*2.5*2.5cm(Reminder: The size is measured manually, please allow 1-2 cm measurement error)Colour: Black(Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)