1. adapt for various kinds of rock with rigidity and high rock compression strength 2. Adaptable for various kinds of hammers including low pressure, medium pressure and high pressure. 3. Material and process:high quality alloy steel bar and tungsten carbides, through heat treatment DTH bits have powerful drilling capacity, great reliabiltiy and low operating cost. Thus, our drilling tools are widely used for drilling and qurrying in mining industries and other construction fields·used high precision steel core tube ,widely used for professional works  ·available in all standard drilling sizes (A,B,N,P,H),various waterways design ·very Fast cutting with very long working life. ·Size can be done as your requests