516Pcs Nuts and Bolts Assortment Kit 21-Sizes M3/M4/M5/M6 Nut Bolt Washer Assort
Size 516Pcs M3-M6. Fastener Type Hexagon Bolt. Head Type Round. Head Style Flat. Thread Style Right Hand. Item Hardness Grade 8.8. Exterior Finish Unfinished. Thread Class 3B.