The Norton MT-134 Diamond Abrasive Stone is a precision grinding tool measuring 4 x 3/8 inches designed for professional sharpening and finishing applications.Norton MT-134 Diamond Abrasive StoneDiamond abrasive surface for superior cutting performance4 x 3/8 inch dimensions for versatile useDurable construction for long-lasting performanceSuitable for sharpening tools and precision grindingIdeal for sharpening cutting tools finishing metal surfaces and precision grinding applications where diamond abrasive performance is required.