Arkon RMCPM2517 Robust Clamp Mount with Security Knob – 17mm Compatible (sku 47849)Arkon's RMCPM2517 Robust Clamp Mount is a highly versatile locking clamp mount with a unique jaw design that has an extra wide clamping range for both flat (including tables, desks, counters, shelves) and tubular (including handlebars, roll bars, wheelchairs, strollers, grocery carts, golf carts) surfaces, including small posts. It is compatible with Arkon's 17mm ball compatible holders and adapters (sold separately). This package includes a Robust