Reddit reviews POWERTEC 11300 Sanding Drum Kit, 20 Pack

Use with drill presses and hand power drillsSand holes, edges, contours and irregular shapes"Four drum sizes: 1/2-Inch x 1-3/4-Inch with 1/8-Inch shank and 3/4-Inch x 2-1/4-Inch, 1-Inch x 2-1/4-Inch and 2-Inch x 2-7/8-Inch with 1/4-Inch shank"Each drum has four sanding sleeves: 2-80 grit for medium sanding and 2-120 grit for fine sandingSlide sanding sleeve onto drum. Turn sanding sleeve nut to the left to tighten. Tightening the nut expands the drum and holds the sanding sleeve in place. Make sure drum is tight.