Quick view True-Stone - Finishing Stone Quickly reshapes and resurfaces abrasive stones to like-new condition. A very hard and coarse silicon carbide stone with 4 different sized half-round grooves on one side measuring 1/16", 1/8", 3/16", and 1/4". Size 3-1/2" x 1-3/8" x 9/16" MSRP: Was: Now: $9.75 Add to Cart Compare