ZHOUSHAN QUNYING SCREW has strong technical force, equipped with advanced equipment and strict tests. Mostly products materials are selected from high quality powder alloy steel with the best materials to exploit market and most new materials, add reasonable process design through tempering, molding, qualitative, nitriding, fine grinding, polishing process of refining. So that the screw barrel has super-hard resistance wear, corrosion resistance, our Injection screw barrel have been exported to more than 40 countries all over the world, like USA, India, South Africa, Turkey, Russia and so on. ,fracture resistance. In order to meet the needs of our customers, we company also provides product design, surveying and mapping, sample processing and repair manufacturing business. All of our products comply with international quality standards (ISO9001-2000). Since the establishment of the company, we are getting greatly appreciated and praise from new and old customers around the world. We will insist on the principle of quality, honest to customers, and provide our customers new information of the products and offer good quality products with good price.