Pro-Line X-Maxx 1/5 Aluminum Adapter Washer. These optional wheel adapters are great for fitting 1/5 sized wheels to the Traxxas X-Maxx axles. Using these will expand the wheel and tire selection you have for your X-Maxx. Package includes four wheel adapters. Features: Machined Aluminum for a Factory Look Blue Anodized Increase your X-MAXX Wheel Selection Options Allows other 1/5 wheels to fit on X-MAXX Specifications: Application: X-MAXX Vehicle Type: Monster Truck Color: Blue Material: Aluminum Accessory Type: Wheel Adapter Scale: 1/5 Inner Diameter: 18mm to 12mm