Zareba® Yellow Screw-On T-Post InsulatorThe Zareba Yellow Screw On T Post Insulator ensures a tight, secure fit on standard (1. 25 or 1. 33) studded T posts and eliminates dislodging in high winds or under heavy loads. These yellow electric fence insulators are packed 25 per bag. Screw on insulator Fits securely on standard (1 1 4 or 1. 33) studded t post Eliminates dislodging in high winds or under heavy loads 25 Insulators per bag