Basalt is a natural column that with a natural steel rustic skin and black inner hard basalt rock, it always be a column with 5 corners or 6 corners, the diameter of basalt column could be 8~10cm, 15~20cm, 25~40cm, 45~60cm and 80~110cm. The small one diameter 8~10cm could to be products of vase, small railing and small natural column in the garden. The basalt with the diameter of 15~20cm could to be produced of lamp in the grass or near the kerb, stone mark, memorials and railing. The column with the diameter of 25~40cm is a very usual size for this kind of products, it always to be seat, table, mark, memorials, fountain and natural column, it is a very good material for the garden decoration. The column with the diameter of 45~60cm is a good material for large decorative material, good for large marks and sometimes set the natural blocks for squares or schools. The column of diameter 80~110 is suit for tables.