I use these wheels after drilling an air intake for a car. After porting, the aluminum surfaces are rough, the surface quality is definitely nowhere near. These abrasive discs will smooth any surface without being too obtrusive or leaving too deep a mark. I use the 1 inch sanding discs that you can find in different grits throughout Revain, but they fall apart very easily. and it would take me about 10 wheels to finish 1 inlet whereas now I can literally do all my finishing work with a single wheel. Very reliable. They ship from China so it takes me about two weeks to receive them but I couldn't find another place that sells these 1.5 inch wheels.
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