raise drill rod
Product FeaturesGREAT's reverse circulation drill pipes use two different types of alloy steel, namely high - strength alloy steel and super - strong alloy steel, according to different diameter and strength requirements.As a professional manufacturer in China that researches, develops and mass - produces reverse circulation drill pipes, we select high - quality raw materials from China's most renowned steel plants. Through professional forging and heat treatment, and with exquisite mechanical p
