Sharp edged t-posts can injure horses and livestock. Our Heavy Duty T-Post Topper Insulator can give you peace of mind as they protect animals from sharp edges.. Safe and flexible - add a single electric wire/tape/braid to the top of existing steel posts using this protective cap or attach wire/braid to the top. This top accommodates 3/8 wire. The front accommodates 1-1/2 in. tape and 3/8 in. wire. Designed to fit over the top of a T Post or Y-Post.Securely holds electric wire, tape or braid.Made from UV resistant plastic for long life and strength.Flexible wire attachment options.10 Year Warranty.UV Resistant