This category includes circular connectors, such as VST C193 connectors and LIGHTHAWK Dual Circuit Multi-Tec connectors, designed for circular mating surfaces. Excludes photovoltaic (solar panel) connectors, rectangular connectors, card edge connectors, terminal blocks, board-to-board connectors, crimp and solder terminals/splices, backplane connectors, flat flexible cable (FFC) and flexible printed circuit (FPC) connectors, D-sub connectors, and coaxial RF connectors.