Product Name: Aq Bq Nq Hq Pq Hrq Rod Subs for Geological Drilling Model NO.: Bq Nq Hq Pq Material: High-Speed Steel Certification: ISO9001:2008, ISO9001:2000, RoHS, CE Type: Drilling Style: Universal Tool Structure: Integral Cutting Process: Drilling Tools Trademark: CROWN Transport Package: Cartons Origin: China Product Description Brief Introductions of Drilling Subs Drilling subs are very short pieces of drill pipe which are used to connect and switch in drills. They are important integral wireline core drilling parts of everyday drilling. Our products use the international standard material. Heat treatment and hardening treatment of the thread surface are adopted to keep the long service life of the products.Drilling subs with foreign standard sizes are all available according to the client's requirements. Specifications of Drilling Subs:Drilling Subs(mm)S75/65 SA75/65 S95/65 SA95/65 S96/6573/57 89/57 108/57 127/57146/57 73/65 89/65 108/65127/65 146/65 168/65 89/75