We are Shaanxi Hainaisen Petroleum Technology Co., Ltd.is engaged in diamond drill bits, diamond core bits ,geological exploration and mining drill bit of R &D,manufacturing and sales.the company is located in XI’AN JINGWEI zone ,spanning between two rivers ,where convenient transportation,abundant ,honest,beautiful scenery .in the early stage of the market has formed a good block ,have agood block ,have a good reputation in the industry ,the company adhere to the long –term development path. Has engaged in a diamond drill bit ,drill geological minning research,design ,manfacturing and...