The Zareba® Large Corner Post Ceramic Insulators are designed to secure electrified wire to wood posts while preventing energy loss through the posts. This pack includes 10 insulators, each with a diameter of 1-3/4 inches. They are compatible with all types of fence wire, including high tensile wire, polywire, polyrope, and 1/2-inch polytape. These insulators are known for their durability and excellent insulating capabilities.