Description:[Sturdy Material] - The carriage screws are made of 304 stainless steel to make carriage bolts high strength and resistant to rust. Compared to ordinary screws, it has higher corrosion resistance, wear resistance and rust prevention, stronger strength, less prone to damage, and longer service life.[Secure and Reliable] - The round head design and square neck of these carriage bolts enable a secure and self-locking fit when applied in square holes; The combination of the bolt's useful shape can be used with hex nuts and flat washers ensures reliable and stable fastening for your projects.[Wide Application] - Carriage bolts are used to fix metal to wood. Widely used in homes and offices, both indoors and outdoors, such as securing headboards, footboards, doors, bed frames, furniture, TV, engineering, or other DIY projects.