diamond core drill 1 fast drilling speed 2 high efficiency and less ... Egypt, Pakistan, Iran, Kuwait, United Kingdom, Russia, Indonesia, Belgium, Australia, Turkey, U.A.E, South Africa, Poland, Iraq, Czech, Korea, Japan ... Straight shank2. Cone shank3. Threaded shankModel1.Sintered diamond drill bit.2.Electroplated diamond drill bit.CompanyEstablished in 1990,Zhecheng Hongxiang Superhard Material ...