520 Pcs Hex Bolts, Nuts, and Washers Set, M3/M4/M5/M6 Stainless Steel Hexagonal Screws, Machine Screws, Full Thread Screws and Fasteners. (520 silver). M4 10 mm - 10 pieces. M4 20 mm - 10 pieces. M4 lock washers - 35 pieces.
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