Fi-Shock IWTPLB-FS Black Pin-Lock Wood and T-Post Insulator Tightly fastens electrified wire to wood, metal and T-posts (1.25 or 1.33 T-posts) For 9 gauge through 22 gauge high-tensile steel wire and aluminum wire, all (both regular and up to " in diameter Molded pin holds wire tightly; pull pin to release wire Packed 25 per bag Color: Black