Sharp-edged T-post tops can be dangerous to your horses and livestock, causing injury to the animals and expensive veterinary bills for you. The Zareba® T-post safety cap and insulator protect animals from the sharp-edged T-post tops. They fit 1-1/4 and 1.33 in standard stubbed T-posts and accommodate any gauge wire and polytape up to 2 in. Holds tape tightly to limit movement.