Round head bolt with a square neck under the head, and a unified thread pitch. Grade 8, Fully Threaded Zinc Yellow The Carriage Bolt Grade 8 1/2"-13 x 1-1/2" Zinc Yellow (Pack of 10) is an essential hardware component designed for a variety of applications. These bolts are ideal for securing wood to wood or wood to metal connections, making them perfect for use in construction, furniture assembly, and outdoor projects. Their robust Grade 8 rating ensures that they can withstand heavy loads and provide superior strength in demanding environments. With a fully threaded design and a corrosion-resistant zinc yellow finish, these carriage bolts are not only durable but also visually appealing. The square neck prevents the bolt from turning when tightened, allowing for a secure fit without the need for additional tools. Whether you are a professional contractor or a DIY enthusiast, this pack of carriage bolts will meet your fastening needs with reliability and ease. Grade 8 strength rating for maximum load-bearing capacity. Fully threaded design for versatile fastening options. Corrosion-resistant zinc yellow finish for enhanced durability. Round head with square neck for secure installation. Convenient pack of 10 for multiple projects.