Shenzhen Koster Metal Products Co.,Ltd is a professional manufacturer and supplier of fasteners & machined parts and the distributor of other C-Class components in China. It is specialized in manufacturing PEM and Southco. As one of the world's global provider of value-based fastening and other C-Class industrial components, Koster serves a vast array of industries and gets enormously support from our customers, such as Textron, Bossard, wherever in domestic or overseas. We provide Green Fasteners (Trivalent Screws) which can meet RoHS compliance with SGS report provided.Main Standards: PEM, SOUTHCO, GB and DIN.