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China special bolt factory | #edw

China special bolt factory

China special bolt factory

China special bolt factory CURVED TUNNEL BOLTS ITEM: CURVED TUNNEL BOLTS FOR SUBWAY AND METRO MATERIAL: BOTH LOW CARBON AND MEDIUM CARBON STEEL DIMENSION: ANSI/ASME B18.2.1 HEX BOLTS AND SCREWS FINISHING: BLACK ZINC PLATED YELLOW ZINC PLATED HOT DIP GALVANIZED Material Carbon steel,alloy s