These abrasives are comprised of high quality silicon-carbide grains and are ideal for fine sanding when staining or oiling hardwood floors. Bona 7" Black Abrasive Discs (5/16" bolt-on) are best used as "finishing" abrasives, as they provide the best color when staining and oiling. The high quality silicon-carbide abrasive grains continually break-down into fine cutting points, giving you the best surface quality for natural, stained and oiled floors. High quality silicon-carbide abrasive grains. Consistent cut for best surface quality. Ideal for fine sanding
