1. This number of hex wideners is having an overall width of 23mm to make a wider wheel distance for stabilization. 2. This couple of hex wideners is having 5mm area which is frequently appropriate some other models providing the sizes are fit. 3. you will discover o-ring a comparable component and springtime metal musical business, springtime with washers, stainless screw in to the reverse component to tense up the hex wideners from free away with a geniune delrin collar spend on secure the hex constantly in position meaning your tires and tires won't spin around, particularly through the crawling track your Axial SCX-10 II can face countless traction.