On December 10th, workers in the manufacturing shop of Yichang Wuhuan Rock Drilling Tools Co. Ltd are rushing to produce a batch of products for Brazilian businessmen. At present, more than 35% of new independent drilling tools including carbide drills and down-hole hammers are exported to South Korea, South Africa, Brazil, Russia, Australia and other countries or regions. The demand for the products which are widely used engineering fields like open-pit and underground mining, water conservancy and hydropower, tunnel excavation and geological exploration exceeds the supply.