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Overview:Small universal coupling is used to transmit on different axes of motion, a single type (WSD), dual-type (WS), Retractable (WSS), ends with the same shaped hole, there is a cylindrical bore, cylindrical with keyway hole, square hole; ends with different hole shape, there is a cylindrical bore with a cylindrical bore with keyway, with cylindrical hole with four square holes, cylindrical bore with keyway and with four square holes.