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China Factory Low Price DIN913 Alloy Steel High Grade 12.9 Class Oxide Black Hexagon Socket Set Screws with Flat Point, Find Details and Price about Machine Screw Self Drilling Screw from China Factory Low Price DIN913 Alloy Steel High Grade 12.9 Class Oxide Black Hexagon Socket Set Screws with Flat Point - Ningbo Teng Qi Fasteners Co., Ltd.