Fits all T-posts, 3/4" diameter sucker rods & 1 1/8" wide U-posts.
Adjusts to fit:
T posts, steel - small, medium & large, with or without studs.
T posts, fiberglass - medium & large sizes only.
Sucker rods - 3/4" diameter only.
U posts - small, 11/8" wide. Backside only.
Small garden U posts—11/8" wide.
Insulator opens to attach anywhere on post.