ShenRong / Muduoxin Industry Co., Ltd is a professional screw manufacturer in China: in 2003 we established our screw factory "Tianjin ShenRong Screws Manufacturing Factory" and begun to export our screws under "ShenRong Fasteners" from 2011. Then we expanded our product range from screws to blind rivets, anchors, bolts and nuts. After 20 years of development, we've become a professional fastener manufacturer for clients all over the world: with various production lines and the most advanced industrial technology, we've become reputable self tapping screw and self drilling screw manufact...