Chengdu Shenlong Thread Tool Research Institute, also known as Chengdu Tool Research Institute Co.,Ltd (CTRI), is a professional manufacturer and trading company based in Chengdu, China. Established in 1956, the company is a bellwether for China's tool industry development, product standards, and quality control. With 301 to 500 employees, including 320 scientific technical personnel, and operating a factory covering 100,000 square meters, CTRI specializes in carbide cutting tools. Their core product lines include Threading Inserts (such as API, Tubing, Casing, Special Customized, and Buttress Threading Inserts), Deep Hole Drilling Tools, Profile Cutters, Cutting Tools for Tubes, Inserts for Hard-to-machine Materials Machining, Cutting Tools for Automobiles, Measuring Gauges, Metal Surface Heat Treatment, Grinding Wheels, Carbide Milling Inserts, Face Milling Cutters for Aluminum Machining, PCD and CBN Inserts, Ceramic Inserts, Carbide Indexable Inserts, Ceramic Rings, and Threading Taps, with a particular focus on extrusion Taps. The company holds ISO 9001 and ISO 14001 certifications and exports a wide range of cutting tools and carbide products.