The A & G RockBolt LTD., which is located at Vancouver, Canada, is engaged in researching and developing of anchoring technology, establishing good relationship with the manufactory in China, with its products having been largely applied to such projects as hydraulic power stations, building pits, slopes, highway tunnels and railway tunnels, to the amount of more than one hundred projects. Especially the hollow grouted anchor, with one-step operation of anchoring and grouting, completely have replaced the solid threaded one in highway tunnels in China and listed in the relative national code (criterion). Type T threaded anchor, which takes special technology and one-time shaping, with strong bond stress with grout, deeper thread teeth and better mechanical performance, is recognized by the designers and constructors and applied in more and more