ChangLing (CLCOIL )has been already recognized as one of three largest threading insert companies, located in XinXiang City which is the strong industrial city in the middle of China. Our company has advanced CNC grinding machines such as large-sized projectors, electronic microscope, etc. Our company is dedicated to R&D of threading inserts, selt tapping insert, keensert(keysert ) since establishment. And we aim at developing mid-market and high-end market's products in the world, via choosing foreign high-quality materials and the world's advanced edge control techniques. Our products are recognized by all customers after being putted into the market. CLCOIL is committed to become the first-class brand of Screw Insert in the world with concept of honesty & spirit of creation.