... 3.Diameter: 26mm - 42mm Chisel Bit Intergral Drill Rod We are a manufacturer specializes in producing kinds ... bits, cross bits, button bits, tapered drill rods, integral drill steels, plug hole integral steels, pick rods ... conditions.The integral drill rod has these advantages: they reduce the expense of impact energy, improves the ... /8H22-108-400-7600 227/8H22-108-600-7800 227/8H22-108-800-71000 227/ ...