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We call this a convertable drum because you can chuck it up in a drill or drill press, remove the arbor and slide it directly onto a 1/2 inch electric motor shaft, or thread it onto a 1/2-20 threaded shaft provided on several power tools.
The central shaft tightens and compresses the rubber centre expanding and tightening it inside the sleeve. Sleeves and drum are sold separately.
Click here to order 50 grit sleeves (pkg of 3)
Click here to order 120 grit sleeves (pkg of 3)