Ideal for all sanding applications, especially edge and contour sanding. For use with power drills and drill presses. Includes 4 x rubber drums, 12.70 / 1/2", 19.05mm / 3/4”, 25.40mm / 1” and 38.1mm / 1-1/2”, and 16 x sanding sleeves, 2 x 80 and 120 grit, for each of the four drum sizes.