Slip ring hollow shaft through bore rotating miniature electrical connector - RobotDigg
Hollow Shaft Slip Ring Through Hole Dia.60mm 6 wires/10A Conductive Slip Ring | eBay
H2586 Series(Hollow Shaft)Through Hole Slip Ring - Senring
Taidacent Hollow Slip Ring Rotary Electrical Contact 2/4/6/12 Wires Collector Ring Conductive Electric Motor Slip Ring Rotating Connector (6 Wires 10A Inner Hole 12.7mm OD 54mm) - - Amazon.com