Hillman 5/8-in x 8-in Galvanized Coarse Thread Exterior Carriage Bolt 812651

Carriage bolts feature a smooth, dome shaped head, without an external drive for appearance, safety and security. Underneath the head is a square section that is the same diameter as the threaded portion of the bolt, allowing the bolt to be installed with just a single tool. Pre-drilled holes are required for installation.