... ,specification: 6''*2''*1''/8''*2''*1'' 4,sharpening stone The combination sharpening stone with one thick-grit-size face for rough grinding ... the other fine-grit-size for finishing, such an sharpening stone is made of the black and green silicon carbide, ... the Vitrified bond, The combination sharpening stone has got the advantages of easy carrying, quick sharpening, suitable hardness and long life, ...