Supplier Assessment Report(s)Link http://sxkaishan.en.alibaba.com/company_profile/capability_assessment.html Main Product Lines Verification Report(s)Link http://sxkaishan.en.alibaba.com/company_profile/capability_assessment.html down the hole hammer geological drill pipe coal drill pipe coal mine drill bit About our company: Certificates This is Ivy Zhao,thank you for browsing our products!If you are interested in our products but have something unclear, please do not hesitate and feel free to contact with me!I will give you quick response and best answer. Skype:Ivy Zhao Trademanager:cn1510238252 Tel:86-13759985092/86-15502935582