Absolutely phenomenal investment! These brushes keep metal looking better than new. The metal spade lugs that attach to the positive and negative terminals of my car battery have always been very corroded. And soaking them in an acid remover, even for a few hours, didn't do any good. When I used these drill brushes to polish these metal connectors, I found that the silver color of these metal connectors was actually wrong; this color came on straight away and showed a very nice shiny copper finish! My machine is now running at full speed!
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