Section 13 ARTICLES OF STONE, PLASTER,CEMENT,ASBESTOS, MICA OR SIMILAR MATERIALS; CERAMIC PRODUCTS; GLASS AND GLASSWARE 68 ARTICLES OF STONE, PLASTER, CEMENT, ASBESTOS, MICA OR SIMILAR MATERIALS 68 04 STONE, OF AGGLOMERATED NATURAL OR ARTIFICIAL ABRASIVES, OR OF CERAMICS, Commodity Code Description 68 04 10 MILLSTONES AND GRINDSTONES FOR MILLING, GRINDING OR PULPING 68 04 21 OTH. MILLSTONES/GRINDSTONES/..OF AGGLOMERATED SYNTHETIC OR NATURAL DIAMOND 68 04 22 OTH. MILLSTONES/GRINDSTONES/...OF OTH.AGGLOMERATED ABRASIVES/CERAMICS 68 04 23 OTH. MILLSTONES/GRINDSTONES/GRINDING WHEELS & THE LIKE, OF NATURAL STONE 68 04 30 HAND SHARPENING OR POLISHING STONES