... 3)from soft to hard rock 4)ISO diamond core drill bits Introduce:They are manufactured with very ... Type: impregnated diamond core bit, surface-set diamond bit, reaming shells, impregnated diamond casing bit, casing shoe bit, diamond reaming shell, diamond sub-adapters ... drilled. Sizes: Specialisted in producing varies kinds of diamond core bits in different international standard sizes(46~325mm) for ...