Made of high-quality material, durable and firm, shockproof and stable and has a long service life. 360 degree rotation, easy and convenient to install and remove. It can be installed on the extension rod of the bracket, connecting multiple mounts to use together. Connect another device for with the Ball Base Adapter. This ball consists of a 1inch ball connecting to a 1/4inch-20 threaded stud, the threads on this ball replace the bolt in any B-size socket arm, and the ball connects to the middle of the socket arm on the opposite side of the tightening knob. If you are looking to mount more than one device but cannot locate multiple mounting points on your motorcycle or vehicle, this base is the perfect accessory for connecting both devices off of one mounting base. It is compatible with for phone holder/camera bracket/walkie-talkie holder, for motorcycles/scooter/cars and many other devices. Item Type: Expand Ball Suitable: for motorcycles/scooter/cars and other devices Suitable Devices: for phone holder/camera holder/talkie-walkie bracket and so on. Colour: black+silver Material: rubber+aluminum stainless steel Package Contents: 1 * Expand Ball Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.