... Solid quality 4 Super antiwear characteristic Hot sale!! Coal Mining spiral steel rod About Us We are a professional manufacturer specialized ... home and abroad to come for business talks.Specifications of spiral drill rods No.Specifications( mm)CraftConnection type with drilling ... NQ2, NQ3, NQTT, HQ3, HQTT, PQ3, PQTT T2 series: T2 46, T2 56, T2 66, T2 76, T2 86, T2 101 T6 series: T6 76, T6 86 ...