QINGDAO LIGAOXIN MACHINERY CO., LTD., FORMERLY KNOWN AS QINGDAO ZHIGAO MACHINERY CO., LTD., STARTED TO PRODUCE DTH DRILL TOOL IN 1998 AND DEVELOPED DTH HAMMER BITS, DTH HAMMER  AND DRILL ROD TOGETHER WITH SHANDONG INSTITUTE OF GEOLOGY.IN 2005, WE REACHED COOPERATION WITH SWEDISH ROCK DRILLING MANUFACTURERS TO JOINTLY PRODUCE DTH DRILLING TOOLS.IN 2010, IT ENTERED THE TOP HAMMER DRILL TOOL AND TRICONE BITS INDUSTRY.AVAILABLE NOW ARE DTH HAMMER , DTH HAMMER BITS, DTH DRILL ROD, TOP HAMMER BUTTON BIT TOP HAMMER THREAD DRILL ROD,SHANK ADAPTER AND TRICONE BIT.PROVIDED DRILLING TOOLS FOR CHINA RAILWAY ADMINISTRATION, CHINA MINING ADMINISTRATION, CHINA WATER RESOURCES ADMINISTRATION AND CHINA CONSTRUCTION GROUP.THE OVERSEAS MARKET WAS OFFICIALLY STARTED IN 2015.AT PRESENT, IT HAS BEEN EXPORTED TO MORE THAN 50 COUNTRIES IN THE WORLD, AND HAS EXCLUSIVE DISTRIBUTORS IN MANY COUNTRIES.