[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. Carriage Bolt Kit Includes Washers and Nuts Made of low-carbon steel with a good surface treatment to make carriage bolts much stronger in low-temperature environmentsThe round head design and square neck of these carriage bolts enable a secure and self-locking fit when applied in square holesThe combination of the bolt's useful shape can be used with hex nuts and flat washers ensuring reliable and stable fastening for your projects Package Included: Carriage Bolt, Washers, Nuts Round Head Square Neck Screws Specification: Thread Diameter(D): M8Pitch(P): 1.25mmHead Diameter(DK): 16mm/0.63-inchSquare Neck Width(K1): 8mm/0.31-inchScrew Length(L): 30mm/1.18-inch [Carriage Bolt Screws] The carriage bolt has many different sizes for you to choose from; These various sizes can satisfy a wide variety of needs, ensuring robust structural support across a host of applications. M8 x 20mm Carriage Bolt Kit M6 x 20mm Carriage Bolt Kit Buying Options Buying Options Customer Reviews 4.5 out of 5 stars 4 5.0 out of 5 stars 2 Material low carbon steel low carbon steel surface treatment color galvanization black oxide Package Included 8sets or 12sets 12sets or 25sets