Josco 20 Piece Spindle Mounted Drum Sanding Kit comes with four different sized Drums 1/2", 3/4", 1" and 2" x2 80g and x2 120g sanding sleeves supplied for each sized drum. 80 Medium Grit is used for moderate surfaces for finishing and levelling and the 120 Fine Grit is for light surface finishing or cleaning. Can be used to sand plastic, wood, steel, non-ferrous metal and leather. The different sizes and grits allow for quick and easy finishing interior surfaces and other hard to reach areas. Sands and polishes most corners, curves and other irregular shapes. This product fits both hand drills and drill presses.