1.The angled bolt head adapter with a 0.4''/10mm hole design to connect to the motorcycle rear-view mirror frame as well as others mini round rail within the stated dimensions. | 2.This 1'' ball mount base made of high quality aluminum alloy for durability and reliability in the most demanding environments. The ball adopts TPU over-molding design, with anti-slip performance. | 3.This 1 inch ball mount compatible with RAM B size 1'' ball and socket component, including double socket arms, navigation mounts, action camera mounts, bike & motorcycle phone mount holders and others devices holders. | 4.With this dual ball adapter mounting kit, you can 360°rotate your Gamin GPS, camera mount or phone holder device . | 5.Small shape and compact size, it's easy and convenient for us to take and carry.