Luoyang Sinorock® Engineering Material Co., Ltd is an experienced manufacturer of anchoring products. It’s specialized in the development, production and sales of anchoring products. Wide Range of Products and Excellent Service Self drilling hollow anchor bolt is the core product of Sinorock®. Meanwhile we also provide various kinds of other products including fiberglass anchor bolt, friction bolt, duplex coating rock bolt, thread bar system and light weight rock drill. Sinorock has a c