The sanding drum set consists of a cylinder with a 1/4" shank that you insert into your hand drill. They are strong, last a long time and are well polished. The drum bushings are great but they come with several cylinder sizes and only a few of these are good enough for any type of sanding, those that didn't fit well on the sanding rollers didn't hold up and therefore didn't spin for sanding, those that work do great for grinding the inside of round or oblong holes in your work piece.
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