United abrasives – sait 70099 2a flap wheel 3″ x 1″ x 1/4″ 40 grit aluminum oxide premium aluminum oxide grain – general purpose. Excellent for cleaning, deburring, polishing, & blending. Resin over resin construction for a strong bond resistant to heat and moisture. Closed coat structure for more material removal. High quality egyptian cotton cloth backing provides superior durability