Feature: 1. Rugged And Tough: This ball mount base is constructed of excellent aluminium alloy and rubber materials, CNC machined and finished with a Class III hard anodised surface to ensure reliability and durability in the most challenging environments. 2. 1 Inch Non Slip Rubber Ball: This AMPS square plate is made of a 1 inch non slip rubber ball that attaches to a square base and includes a variety of predrilled holes with industry standard AMPS hole patterns. 3. Good Compatibility: This metal AMPS adapter plate has good compatibility and is compatible with base B size 1 inch (approx. 2.5 cm) ball double socket arm, which is very practical. 4. Easy To Install: This aluminium alloy ball mount base is very easy to install, you can just fix it to the desired position, without the need of complicated operation, and very convenient. 5. Wide Application: This ball mount adapter plate has a wide range of applications and is perfect for use as boats, kayaks, semi trucks, cars, trucks, treadmills, and a variety of off road vehicles. Specification: Item Type: Ball Mount BaseMaterial: Aluminum Alloy, Rubber. Package List: 1 x Ball Mount Base