railway highway construction, water conservancy and hydropower engineering drilling field all assignments. Drilling tools in China enterprise, the first to enter the international market and obtain independent import and export right products in Australia, Europe, north and South America, Africa, southeast Asia, more than *0 countries and regions, reputation. Export ChuangHuiE always in drilling tools in the total export industry dominated the first place. Product features: · material selection of high strength and high quality alloy steel and the strengthening of heating surface · technology, the impact that the deformation · provided by user brazing drilled sample and the tail part number, for you produce all types of qian tail naming: W-the total length of spline number-types of thread can we provide according to user requirements applicable to all kinds of the brazing drilled tail. The length of the tail brazing than **0 mm