By keeping your cattle moving through this adjustable 20-foot Straight Crowing Alley, you'll save time and cut costs. Available in 20-foot complete units (or additional 10-foot sections to fit your needs), can be set up with adjustable width levers on the right or left side. Tailgate swings outward and locks open. For portable or permanent use. It can be mounted on wood or concrete, or set on solid ground and staked down.