This is a set of spring bar tools and spring bars. After purchase, please let us know your desired size from 8 to 25mm (in 1mm increments). Two sets of spring bars, for a total of 4, will be included. You can choose two sets of the same size, or two sets of different sizes. If you do not contact us with your size within 24 hours of purchase, we will ship the spring bars with a size of our choosing. When selecting the size of the spring bars, please specify the width of the strap you wish to attach (lug width).