Truly secure your mobile phone while riding or driving when using this 20mm Locking Ball Mount Adapter for SlimLink from Peak Design with your own Peak Design SlimLink phone case or Universal Adapter, and a separately available third party 20mm-compatible ball mount or arm. With this mount secured in a 20mm-compatible mount, the SlimLink connection is designed to mechanically and magnetically lock your phone in place with a SlimLink case or adapter. The SlimLink connection with push-button release lets you attach or remove your phone with one hand, and mount it in either portrait or landscape orientation.