What are the common types of down-the-hole drills

Drilling Tools is a mining machinery tool accessories manufacturer integrating product development, production, custom processing and after-sales service..Our factory adopts domestic advanced equipment, superb heat treatment technology, mass production of various diamond drill bits, diamond composite anchor rod bits, cemented carbide drill bits, in-line pneumatic drill bits, column tooth drill bits, coal drill bits B22 pneumatic drill rods, B19 anchors Rod drill pipe, geological drill pipe, spiral drill pipe, coal drill pipe, water exploration drill pipe, pneumatic rock drill series, etc., Widely used in mining, tunneling, engineering construction projects, etc..my factory All current products from raw materials to finished products are strictly inspected in accordance with ISO9001:2000 quality system standards and maintain continuous and effective operation..The company's products are sold to major mining bureaus, coal mines, coal mining machinery factories and distributors throughout the country, and the product quality has been unanimously praised by users.