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4.8 Grade DIN7500 Carbon-Steel Zinc-Plated Hex Head Cross-Drive Triangular Lock Screws M4m6m8m10, Find Details and Price about DIN7500 Triangular Lock Screws Carbon Steel Lock Screws from 4.8 Grade DIN7500 Carbon-Steel Zinc-Plated Hex Head Cross-Drive Triangular Lock Screws M4m6m8m10 - Hebei Lingke Metal Products Co., Ltd