These 3M sanding blocks are easy to use, have a nice shape and use sandpaper efficiently. However, they have an annoying disadvantage. You will turn your workpiece black if the rubber housing rubs directly against the workpiece, e.g. B. when sanding along a corner. You should use the short end on the corners to prevent this. Considering their price, about 1/3 the cost at retail, a little caution is worth the difference. Incidentally, the more expensive black sanding blocks do the same thing.
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