Big Horn 19540 9 piece super long sand kit 3" drums. 9 piece super long sanding drum set includes 1/2x3, 1x3, and 1-1/2x3". 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.