Luoyang Dingrui Material Technology Co., Ltd was established in March, 2008, and the registered capital is 510 million, located in Luoyang High-tech Development Zone, it is a private technology enterprises in Luoyang Venture Center. The company is mainly engaged in reasearch and development, production and sales of small-diameter seamless steel pipe hot rolling equipment, hollow anchor bolt rolling equipment, hollow anchor bolt, bearing steel pipe, seamless steel pipe. Under the strong support of the geotechnical engineering experts at home and abroad, the company is specialized in the research and development of hollow grouting anchor series: Hollow Grouting Anchor Bolt, Self-Drilling Hollow Grouting Anchor Bolt, Semi-self Drilling Hollow Grouting Anchor Bolt, Prestressed Hollow Grouting Anchoe Bolt, Combined Hollow Grouting Anchor Bolt, Anchor Bolt with Exhaust Pipe and High-strength Threading Grouting Anchor Bolt, the products have been widely used in road, water and electricity, railway, subway and other engineering fields.