Round Head Hexagon Socket Featuring a smooth, dome‐shaped head that minimizes snags and enables higher torque and clamping force, these bolts streamline assembly and reduce installation time304 Stainless Steel Manufactured from premium 304 stainless steel for outstanding corrosion resistance and long‐term durability, these bolts deliver reliable performance in harsh industrial, automotive, and outdoor environments Hardware Set The package includes various sizes 6mm 20 pcs, 8mm 25 pcs, 12mm 25 pcs, 16mm 25 pcs, 20mm 25 pcs, 25mm 15 pcs, 30mm 15 pcs plus 150 flat washers, 150 spring washers, 150 nuts, and 1 wrench for complete assembly needstile Usage Scenarios Widely used in industrial production, automotive assembly, furniture manufacturing, machine tooling, and steel fabrication, these metric bolt assortment provide impressive clamping strength while offering a neat, finished lookSecure Grid Box Packaging M3 screw kit is packed in a sturdy grid‐design box With label that organizes and protects every component, ensuring hasslefree storage, safe transport, and quick access during assembly Round Head Hexagon Socket: Featuring a smooth, dome‐shaped head that minimizes snags and enables higher torque and clamping force, these bolts streamline assembly and reduce installation time 304 Stainless Steel Manufactured from premium 304 stainless steel for outstanding corrosion resistance and long‐term durability, these bolts deliver reliable performance in harsh industrial, automotive, and outdoor environments Size Name:6mm, 8mm, 12mm, 16mm, 20mm, 25mm, 30mm|Item Dimensions:0.39 x 0.39 x 0.39 inches|Item Diameter:3 Millimeters|Number of Pieces:601|Screw Head Style:Button|Thread Size:M3|Compatible Groove Diameter:3 Millimeters|Color:Silver|Item Shape:Hexagonal|Material Type:Stainless Steel 304|Finish Types:Plain|Fastener Type:Bolt|Number Of Items:601|Set Name:M3 Nuts and Bolts Assortment Kit (601 Piece)|Part Number:BSCK01|Model:M3|Unit Count:601.0 Count| Screw & Bolt Assortment Sets