This 1'' ball mount base made of high quality aluminum alloy material, integrated molding, smooth surface and solid body. The anle bolt head has a non-slip design, allowing your device to be securely attached to it. This 1'' ball mount base with 10mm mounting hole. Suitable for installation to rear-view mirror frames or other bolt heads within the stated dimensions.The 1 inch ball holder compatible with RAM B size and 1'' ball socket arms. Also works for other devices with 1'' swivel ball mounting pattern, Such as some navigation mounts, action camera mounts, mobile phone holders, etc. Suitable for installation on bike, bicycle, motorcycle, stroller,ATV, mountain bike, dirt bike, trek bike, road bike, golf cart, electric scooter, etc. Transition: 1cm=10mm=0.39inch Please allow 1-3mm error due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks very much!

5.Small shape and compact size, it's easy and convenient for you to take and carry. 4.With this dual ball adapter mounting kit, you can 360°rotate your Gamin GPS, camera mount or phone holder device freeely during travel. 3.This 1 inch ball mount compatible with RAM Mount Socket Arms B size 1'' ball component, including double socket arms, navigation mounts, action camera mounts, bike & motorcycle phone mount holders and others devices holders. 2.This 1'' ball mount base made of high quality aluminum alloy for durability and reliability in the most demanding environments. The 1 inch ball adopts TPU over-molding design, with anti-slip performance. It is durable and sturdy. 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.