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Standar: DIN125, DIN9021 SAE, USS, non-standard flat washer
Diameter: M3-M100, 1/8"~4"
Surface Treatment: Zinc plated, black oxide,hot dip galvanized, plain
Packing: Small box packing/bulk packing
Screw Manufacture: Punching/surface coating
Shipping process: Quality control/packing/final inspection/shipping