1) With its 92mm diameter, it can guarantee clear pass for dia89mm drilling rod. It can also meet the requirements of triple pipe jet grouting construction and anchoring. 2) With its hydraulic crawler chuck, it is much more convenient and easier for changing the drilling tools. 3) With its large torque of rotary head and our intensive drilling tools, it can achieve drilling through without making any guiding holes, which can save a lot of time. 4) It adopts large-torque rotary head, that when equipped with our enhanced type jet grout drilling tools, it can be really time and cost saving without making guiding holes in most of working layers.