Siemens intermediate ring kit 0.5, 1, 5, 10, 20, 40mm aperture; 31mm diameter with C-type thread, used to screw into the lens and the camera, located in the distance; 6GF90011BUSiemens intermediate ring kit 0. 5, 1, 5, 10, 20, 40mm aperture; 31mm diameter with C type thread, used to screw into the lens and the camera, located in the distance; 6GF90011BU About koeedmro At koeedmro. com, we are professionals in the field of industrial electronics. We specialize in the sales of industrial electronic PLCs, HMIs, Motors, Drives, Converters, and more. We proudly carry top brands including Siemens, Omron, FANUC, SCHNEIDER,