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DIN7991 good quality stainless steel 304/316 hexagon socket countersunk head screws GB70.3 bolts ISO10642 zinc-plated bolts, US $ 0.05 - 0.35 / Piece, Jiangsu, China, FBR, DIN7991-10.Source from Nanjing Flybear Hardware Products Co., Ltd. on Waimaotong.com.