Material: Constructed from durable metal, these hexagon head bolts can withstand heavy loads and high tension. Their robust construction guarantees the longevity of projects and reliable structural integrity Strong Grip: The practical serrated design on the underside of the hexagon head bolt ensures a firm grip on material surfaces Corrosion Resistance: With a polished protective finish, these hexagon head bolts offer excellent rust resistance. They perform well in both dry and humid environments, ensuring durability even under harsh conditions Standard Size: The precise hexagonal head design allows for easy tightening using a standard wrench or socket wrench with a black surface oxidation treatment, these bolts are strong, durable, and have excellent wear resistance, high hardness, and high strength. Please do not install them in wet environments or outdoors.