The RAP-B-200-1-TRA1-18U consists of quick release post pinlock base, 18" rigid aluminum rod and single socket arm for 1" ball bases/adapters. The pinlock base contains a unique t-bolt mechanism that stabilizes the entire mount, along with making it compatible with most kayak tracks. The 18" rigid aluminum rod can be bent to position your device to its optimum viewing location. The single socket is compatible with all 1" ball bases and adapters.