Hunan Tianying Drilling Machine Manufacturing Co., Ltd, adjacent to the beautiful Xiang River, is located in high-tech development area of Zhuzhou. As a specialized manufacturer of tri-cone bits, its products fall into two categories: rock lines and oil lines. The rock tricone bits covering more than 30 specifications fall into two categories: air cooled bearing series and sealed bearing series. Our annual capacity is 10000 pcs. The Tianying Tri-cone bits: selected material, fine workmanship, reasonable price, various specifications. The rock series comply with Quality Standards GB/T13343-2008, while the oil series comply with SY/T6164-2008. Tianying Products, integrating with IADC models, are popular in strip mining and oil exploitation