Beijing Sunrole Etern Science and Technology Co. Ltd. For the products of diamond core drilling bits and reaming shells, we are not a manufacture, but we are a good supplier. Our competence is mainly based on the three aspects: identification of the manufactures, quality control for the products and logistic services. • We are in contact with almost all the Chinese manufactures, we have visited many of them, all our partners are proven to be competent and reliable. • We are equipped with professional instruments for the quality control of our products. We can insure you the specifications of our products. • Our stockage and logistic facilities can insure you a prompt delivery whenever and wherever you are drilling.