This is a set of a spring bar tool and spring bars. After purchase, please let me know your desired size from 8 to 25mm (in 1mm increments). You will receive two pairs of spring bars, for a total of four. You can choose two pairs of the same size, or two pairs of different sizes. If you do not specify the size within 24 hours of purchase, I will ship the spring bars in a size of my choosing. When selecting the spring bar size, please specify the width of the strap you want to attach (lug width).