... )Threaded connection: R22, R25, R28, R32, R38, T38, T45, T514)Tapered connection:6°,7°,11°,12°5)Processing technic:Cold pressing ... ,Hot insetTapered button bits (28mm, 30mm 32mm, 34mm, 36mm, 40mm, 42mm, 44mm and so on with different degree taper)Tapered Rod (Rod ... ,76mm,89mm,102mm,115mm, 127mm.)Down the hole drilling(drill bits, hammers, spare parts, drill tubes)Buttons type :Spherical, Ballistic Drill ...