1. This number of hex wideners is having an average width of 25mm doing a wider wheel distance for stabilization. 2. This range hex wideners is having 4mm opening which will be appropriate other models provided the sizes are fit. 3. you'll discover o-ring for a moving fancy component and springtime steel musical company, springtime with washers, stainless screw in the reverse part of tense up the hex wideners from free and a specific delrin collar spot into secure the hex constantly constantly in position for that reason your tires and tires are not susceptible to spin around, particularly through crawling track your Axial SCX-10 II can face enough traction. This system includes :