1. This number of hex wideners is having an average width of 25mm to do a wider wheel distance for stabilization. 2. This range hex wideners is having 4mm opening and this can be appropriate other models supplied the sizes are fit. 3. you will discover o-ring for a moving fancy component and springtime steel musical company, springtime with washers, stainless screw inside the reverse part of tense up the hex wideners from free along with a certain delrin collar spot directly into secure the hex constantly constantly in position therefore your tires and tires aren't prone to spin around, particularly through crawling track your Axial SCX-10 II can face sufficient traction. This system includes :