uxcell15mm Ferrite Cores Ring Clip-On RFI EMI Noise Suppression Filter Cable Clip, Black 5pcs

Working excellent. Highly recommend these.

Does what it is supposed to do, help eliminate RFI. Workes on large diameter coax cable. Not sure how much power it can handle, though.

These work well at reducing Radio Frequency Interference. Snap Choke Cores will NOT eliminate RFI, but will reduce it to a point where interference will not be an issue. Take Note: the diameter of cable / power cord to be used on. The power cord on my microwave oven has a width of 12.7 mm (1/2 inch). The inner diameter of the snap choke core must have space to fit over cable / cord. The more snap choke cores used the higher the RFI suppression. So many uses: AC power cords, coax, DC power cables, Audio and Video cables.

I was always skeptical that these cores work but I saw them working in real time. I was helping a friend solve RF interference into his computer. His ham transmitter and antenna were very close to the computer and when he would transmit the screen would get a bunch of pattern lines on it, the keyboard and mouse would not work, and lots of noise coming out of the speakers. We started adding these cores to the power and signal lines for all the devices and one by one as we went the problem completely disappeared. Not just a little better or that's good enough. It was completely solved. I am no longer skeptical. I use these as well and I was able to get instant results solving some RF interference problems with a computer to ham radio interface. Make as many loops through the cores as you can and still snap it closed for best results. Buy with confidence. These work.

The center hole of the actual ferrite is 15 mm and is prefect. The center hole of the plastic cover which holds the ferrite in place is smaller than 15 mm and needs to be enlarged to fit over LMR 600. Once the hole is enlarged, they work fine. I would recommend them but be prepared to enlarge the center hole of the plastic cover.

Fit was just a little loose

I installed aftermarket LED headlights in my Cobalt SS. I normally use satellite radio so did not realize how much RF interference they produce until I used FM. These cores fixed this issue. Installed in about 2 minutes per side., ran double loop of input wire through core and no more interference.

Clips are way too difficult to open, broke 2 of them just trying to open them up. I then put 5 of them on a small AC to DC laptop adapter to try and eliminate the noise it was putting on the line, but it had no effect.