Fi-Shock ITSOY-FS Screw-On T-Post Insulator Do your insulators detach during high winds? Our screw-on insulator is your answer. The Fi-Shock 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. Features Screw-on insulator Fits securely on standard (1.25 or 1.33) studded T-post Eliminates dislodging in high winds or under heavy loads Packed 25 per bag Color: Yellow USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.