Manufactured with a rugged, durable layer of elastomer on the cup to help prevent accidental scratches or marring in the work surface during operation. With 1/4” shank. Applicable for rubber and plastic mold cleaning, cleaning pipe ID, removing rust, weld scale and spatter, cleaning castings, burr removal, rubber flash removal, carbon removal, spot facing, cleaning and finishing recessed areas. As a safety precaution, shank must be fully inserted into the chuck or collet and tightened securely. 0.005" Fill diameter. Measures 1/2" diameter by 2-3/4" length.