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Amazon.com : Electric Small Slip Ring Rotating Conductive Slip Ring 2 Wires Diameter 22MM (2A) : Tools & Home Improvement
Wind Generator Slip Ring 2 Wire 30 AMP Per Conductor / Wire - Hurricane Wind Power
Taidacent Hollow Slip Ring Signal Power Continued 2/4/6/12 Road Collector Ring Conductive Electric Motor Slip Ring Rotating Connector (2 Wire 1.5A Inner Hole 7mm Outer Diameter 22mm) - Amazon.com