This 1 inch ball handlebar clamp mount base fit for handlebars 0.5 inch (12mm) / 0.87 inch (22mm) / 1 inch (25.4mm) / 1.26 inch (32mm) in diameter Compatible with RAM Mounts & BRCOVAN any B size 1'' ball double socket arms Main body made of 6061-T6 aluminum alloy material with CNC machining and iii grade hard anodized surface for durability and reliability in the most demanding environments. TPU over-molded ball head, anti-slip and wear-resistant 1'' TPU ball handlebar clamp mount base for round rails diameter 0.5'' 0.87'' 1'' 1.26''