The special internal structure of the CIR series DTH drill bits, designed according to the latest rock drilling theory, provides maximum energy, fast drilling speed and low air consumption. Due to high-quality alloy steel materials and advanced processing technology, the performance and long service life of the  CIR series DTH drill bits. Due to the simple, reliable, easy-to-assemble and disassemble hammer internal structure, the problem rate is low and easy to maintain. It can be interchanged with DTH drill bit and drill bit and drill pipe.