Our factory is a large casting enterprise, production and processing of solid cone, Cone, machine casting products, has many years of casting experience and advanced equipment, with a large car and tempering equipment, strong technical force. Chaoyang control alloy hollow drill bit using scientific formula, a special heat treatment process, quality and cheap, according to customer demand, we help clients OEM non-standard impact drill, winning the trust of more customers. Interested manufacturers please contact us.