Big Horn 19537 9-piece 3/4-Inch dia by 2-Inch replacement sleeves are designed to be used with Big Horn 19535 12-Piece Extra Long Sanding Drum Set, sold separately. All sanding drum kits feature aluminum oxide resin bond spiral no-lap sleeves. Self expanding rubber cushioned drums have 1/4″ shank. Excellent for sanding holes, edges, contours, irregular shapes and wider surfaces. Each set includes 1 set of replacement sleeves.