... export volume has reached one million pieces. The 90 drill bit researched and developed by our company has won a high ... The ZRC80, ZRC100G, ZRC100G-A, ZRC130G, & ZRC150G, impact test machines and 90, 115, 138, 152, 165, 178, & 203 high pressure bits, have ... Harbor Crossing, Guizhou hydropower station, Chenchao high-speed railway, and Chentang highway. The products have been deeply welcomed by users ...