... 3,specification: 6''*2''*1''/8''*2''*1'' 4,oil stone The combination oil stone with one thick-grit-size face for rough ... grit-size for finishing, such an sharpening stone is made of the black and green silicon carbide, brown Alumina oxide and ... white Alumina oxide with the Vitrified bond, The combination sharpening stone has got the advantages of easy carrying, quick sharpening, suitable ...