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M3 M4 M5 M6 M8 Carbon Steel Machine Screws DIN7991 Hexagon Socket Flat Head Machine Screw, US $ 0.01 - 0.08 / Piece, Zhejiang, China, JingHong, JH-JA-M16S3-3.Source from Wenzhou City Jinghong Fasteners Co., Ltd. on Waimaotong.com.