The 1' ball handlebar mount accommodates handlebars 0.5" to 1.26" in diameter. Set come with three soft rubber ring inserts to provide a snug fit and protection of the mounting surface. Rubber ring pads diameter: 0.5' / 0.87' / 1'. The 1' ball mount base utilizes rubber-insert and lockbolts to prevent loosening in high vibration for mounting to motorcycle or bike handlebars as well as other round rails within the stated dimensions. This ball mount made of 6061-T6 aluminum alloy for durability and reliability in the most demanding environments. The ball joint adopts TPU over-molding design, with anti-slip performance. This 1 inch ball handlebar mount base compatible with RAM Mounts B size 1' ball and socket component, including double socket arms, navigation mounts, action camera mounts, bike & motorcycle phone mount holders and others electronic device holders. Suitable for installation on bike, bicycle, motorcycle, stroller, mountain bike, dirt bike, trek bike, road bike, golf cart, electric scooter, ATV, etc. 1887 Perfect after-sales service: If you have any quality issues or do not like it after receiving it, please contact us and we provide free return and exchange services