12 Piece set.
No-lap aluminum oxide resin bond sleeves. Excellent for sanding holes, edges, contours, and irregular shapes. Includes 4 extra long 2-inch wide drums with diameters of 1/2-inch to 1-1/2-inch. 1/4-inch diameter shanks. Also Includes one fine grit and one coarse grit sleeve for each drum size in kit. 12-piece set.