Yeah Racing 12mm Aluminum Hex Adaptors. These optional hexes are intended to add track width to your RC rock crawler. With a wider track width, you can also increase the chassis flex due to a leverage effect of being able to put more force on the outer wheel. This translates to more grip during climbing. Package includes four hex adapters with grub screws.
NOTE: This will fit wheels with a center hole of at least 5mm.
