The difference between the self-drilling self-tapping screw and the ordinary self-tapping screw is connected through the two processes of drilling (drilling thread bottom hole) and tapping (including tightening connection); when the self-drilling self-tapping screw is connected, the drilling and tapping screw are combined once. It first uses the drill bit in front of the screw, and then uses screws (including fastening connections) to save construction time and improve construction efficiency.1. We have a professional sales team, they have mastered the best technology and manufacturing processes, have years of experience in foreign trade sales, with customers able to communicate seamlessly and accurately understand the real needs of customers, providing customers with personalized service and unique products. 2. Our products are widely recognized and trusted by users and can meet continuously developing economic and social needs. We welcome new and old customers from all walks of life to contact us for future business relationships and achieving mutual success! 3. In the new century, we promote our enterprise spirit "United, diligent, high efficiency, innovation", and stick to our policy"basing on quality, be enterprising, striking for first class brand". We would take this golden opportunity to create bright future. 4. We are sincerely looking forward to cooperate with customers all over the world. We believe we can satisfy you with our high-quality products and perfect service. We also warmly welcome customers to visit our company and purchase our products.