1. This amount of hex wideners is having a general width of 23mm in order to make a wider wheel distance for stabilization. 2. This few hex wideners is having 5mm area which is often appropriate some other models providing the sizes are fit. 3. you will find o-ring a comparable component and springtime metal musical company, springtime with washers, stainless screw in to the reverse element of tense up the hex wideners from free away with a geniune delrin collar invest in secure the hex constantly constantly in place meaning your tires and tires won't spin around, specially through crawling track your Axial SCX-10 II can face countless traction.