1. This number of hex wideners is having a total width of 23mm to obtain a wider wheel distance for stabilization. 2. This few hex wideners is having 4mm opening that could be suitable for countless other models provided that the sizes are fit. 3. you'll find o-ring utilizing one component and springtime metal musical company, springtime with washers, stainless screw in regards to the reverse aspect of tense up the hex wideners from free and a geniune delrin collar put in to secure the hex in position so the tires and tires wont spin around, specially through crawling track your specific Axial SCX-10 II can face sufficient traction. Them includes :