TC serial slip ring capsule is a micro slip ring, there is a 7,or15,or20 mm through-bore in the center of the shaft, it has the goodness of capsule & through bores slip ring ,this design features long life & low cost, fiber Precious metal brush contact technology for ultimate performance in many challenging applications. With aluminum body, double precision roller bearings provide smoother running, lower torque and lower electrical noise. it is suitable for signal & low power transfer.(More product information welcome to visit slip ring.net)