I have installed cable for the past 6 years. All fittings should be brass. I just took in a bucket that weighed 57 pounds of nothing but cable fittings and was paid brass price for it. In the first picture is a ground block. 80 percent of the time those are aluminium. The round barrels connected to it with the blue in the middle is brass. But not worth the electric to cut them off. I just throw them into my dirty aluminium bin. If it is magnetic its just crap metal so to say throw it in with shred. I get twenty cents a pound for coax at the local escrap yard
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