Meet the AbMat Split Squat Pad: a fitness accessory that creates a single leg squat station on your rack. You simply have to rack your barbell at the height you want, slide it onto the end of the bar and load a 45lb plate on the opposite end.
The Split Squat Pad has a hexagonal shape to lock your foot pin place. It measures 6 inches in diameter. The pro version is a bit larger (7-inches). You can find out more about it here.