When paired with Alley Holding Frames, Slider Gates, Lift Gates, etc.; Stronghold Spool Adjustable Alley Panels provide an alley way width range from 16 to 28 inches, allowing you to work with any size of calf. Pre-punched for optional Alleyway Can't Back. Picture shows (2) Spool Adjustable Alley Panels and (2) Alley Holding Frames.