1/2-Inch by 1/2-Inch replacement sleeves are designed to be used with Big Horn 19530 15-Piece General Purpose Sanding Drum Set, sold separately * No-lap aluminum oxide resin bond sleeves * Excellent for sanding holes, edges, contours, and irregular shapes * Includes 3-fine, 3-medium, and 3-coarse 1/2-Inch by 1/2-Inch replacement sleeves * Manufactured in USA