36 GRIT Coarse 8" x 20-1/8" Floor Sanding Sandpaper Sheets are cut to fit Essex Silverline SL-8 Drum Sanders with the slotted drum. This style drum has a paper slot which expands and then clamps and secures the paper after it is inserted and then tightened. These sheets will NOT fit Silver-Line SL8 sanders with the hook and loop style drum. Please check your current sandpaper size or consult your sander's owner's manual to ensure correct ordering. Partial boxes are NOT returnable.