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M2.2-M6.3 stainless steel A2-50 A2-70 tapping screw brass galvanized steel bottom head bolts screws, US $ 0.001 - 0.5 / Piece, Jiangsu, China, FBR, DIN7981-1.Source from Nanjing Flybear Hardware Products Co., Ltd. on Waimaotong.com.