Dare Western Screw-Tight T-Post Insulators for Wire
Adjusts to most any size T-post & will fit 3/4" to 9/16" round posts & 1" fiberglass T-posts. Fits posts with and without studs. Opens to attach anywhere on post. Holds wire, even heavy barb, 1" from post.
Yellow polyethylene. (#2193-25)
This insulator is not designed for tape.