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DIN933 High-Strength Carbon Steel Black Grade 8.8 10.9 12.9 Hexagonal Bolts, Find Details and Price about DIN933 Hex Bolts DIN931 Hex Bolts from DIN933 High-Strength Carbon Steel Black Grade 8.8 10.9 12.9 Hexagonal Bolts - Hebei Yunchang Fastener Manufacturing Co., Ltd.