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Carl
Greater than one weekI purchased these to clean up weldspatter as a machine builder. These are garbage.
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C. Hawkins
Greater than one weekThe first bristle disc I used lost nearly half its bristles within 30 seconds of use. The bristles should be more pliable, but are too brittle and break off too easily.
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David J.
> 3 dayThe block is cast iron. The heads are aluminum. The mounting surface must be as clean and free of any debris. I used the green on the block surfaces and heads. They both came up mirror clean without any markings, scratches or grooves. Definitely a great tool for engine builders and gasket removal.