This rectangular sanding sponge 4 sided medium grit by Richard is used for drywall compound, wood and other materials. Ideal for sanding large surfaces (not recommended for sanding corners). This versatile sponge can be used wet or dry, it is reusable (rinses clean with water) and lasts longer than sandpaper. Designed for tool # 18270 it is 8 7/8" x 4" x 3/4" in size. Sold in a 3-pack.