Needle-Bearing Specification: - Product Name: Conductive Slip Ring Outer diameter: 5 mm Channel: 4CH, 6CH, 8CH Current: 1A Voltage: 220V Material: Plastic There are 3 sizes for your reference: - OD 5mm, 4CH 1A - OD 5mm, 6CH 1A - OD 5mm, 8CH 1A