These sturdy tread-in plastic double foot posts from Gallagher measure 39" long and feature nine numbered lugs so that they'll work with virtually all livestock species. They have a unique twist-n-lock system that makes for simple, secure attachment, and they work well for all Turbo, Polywire, and tape up to 1/2". | Gallagher Tread-In Plastic White Double Foot Post | Size 39"