This 1" Ball Adapter Thread Post Ball Mount Base is compatible with ram mounts any B size 1'' Ball Double Socket Arm. Suitable for other devices with 1 inch swivel ball mounting pattern system. Please double check the required thread bottom size before purchasing! Anti-skid and not afraid of shaking: rubber material frosted ball head, grainy can reduce slipping. Threaded rear-view mirror installation, easy to disassemble, can be installed directly, saving time and effort. No rust in the rain: rubber and high-quality aluminum alloy materials are used, which is consistent in outdoor riding in wind and rain, which is difficult to rust and more resistant to corrosion. CNC precision machining: CNC integrated molding, smooth surface, solid body. TPU overmolded ball head with anti-slip properties. Wide range of applications: suitable for motorcycles, electric vehicles, and ATVs with a diameter of M6 on the rear-view mirror, with a thread pitch of 1mm.