Ordered these to fit a locally made open ended squat rack. I was wondering if I needed 2 1/4" or 2 1/2" but after careful measurements. I found I needed 2 3/8 inches (6 cm exactly). They were well packaged and very good quality. They fit perfectly just by tucking them in with my hands, perfectly tight, and now I don't have to worry about dust, bugs, or drops of sweat getting inside. Also, I don't worry about my feet being accidentally cut.