Yiwu Sancheng Hardware & Spring Co.,LTD It is a sole company, which is engaged in developing, designing, and manufacturing precise spring, spring piece, metal button, and adjusting pin, and it utilizes several computer numerical controlled machinery equipment and diversified raw materials to manufacture and process. The company possesses various precise production equipment, and powerful technology as well as production capacity. Collecting the management experience in this circle for many years, it achieves excellent credit, supreme quality and the support and trust of the wide customers.