Feature 1Wide Application: 1in ball adapter fits for 915mm/0.350.59in diameter rails, bikes, scooters, mobile phones, navigations, rearview mirrors, etc. 2Premium Material: Double ball bracket is made of aluminum alloy and rubber material, wear resistant, rustproof, sturdy and durable. 3Excellent Performance: Ball mount base can prevent loosening in high vibration, anti slip and provides a secure grip with slight flexibility. 4Professional Design: Professional manufacturing, exquisite workmanship, weather resistant, can be used in harsh environments, stable and reliable. 5Simple Installation: The installation is simple, M4 mounting hole, no complicated operation is required, convenient for using, save your time.Item Type: Ball Mount BaseMaterial: Aluminum alloy, rubberBall Head Size: Approx. 1in/25.4mm .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Mounting Hole: M4Applicable Size: Approx. 9-15mm/0.350.59in railsApplication: 1 inch ball bracket is suitable for 9-15mm/0.350.59in diameter rail, bikes, scooters, mobile phones, navigations,rearviewmirrors, mini handlebar, etc.Package List1 x BallMount Base1 x U ShapedAccessories2 x Screw2 x Nut1 x Washer1 x Hex Wrench1 x User Manual