Features 1RUGGED MATERIAL: The metal AMPS adapter plate feature rugged marine grade aluminum alloy, CNC machining and Class III hard anodized surface finishing to ensure reliability and durability in the most challenging environments 2CONSTRUCTION INFORMATION: The mounting base is made of a 1in non slip rubber ball attached to a round base and include a variety of pre drilled holes with industry standard AMPS hole patterns 3APPLICABLE MODEL: Metal AMPS round adapter plate is compatible with base B size 1in (about 2.5cm) ball double socket arm, useful and practical 4WIDE APPLICATION: The ball mount AMPS adapter is ideal for use as a mounting base for boats, kayaks, semi trucks, cars, trucks, treadmills and various off road vehicles 5RUBBER JOINTS: Ball joints of drill mount ball plate base are coated in rubber material, which is elastic, wear resistant, not easily discouraged, come with 4 holes Item Type: Metal AMPS Adapter Plate Material: Aluminum and rubber Package List 1 x Metal AMPS Adapter Plate