This may be obvious to some, but not to me. I am an IC design engineer, as such I rarely do any practical work. This morning I had to fix some electronics which were custom made by a third party for my company. On removing the front panel I saw this gray box clipped to a bundle of wires (images below), I have no idea what it is or what it does. After 10 minutes of fruitless googling for "gray box clipped to wires" I find myself here asking this question. The inside looks like some type of metal or ceramic. I thought it might be magnetic but it is not.
So can anyone identify it and tell me what it does?
I fixed the problem, which was not related to the wiring.