Features: Replacement of Parts# 13815 Brand new and high quality 100%. Specification: Compatible with: Brand name: RedCat, Item Number: RER09587, RER09588, RER09585, RER09586, Model: 1/10 Everest Gen7 Pro and 1/10 Everest Gen7 Sport Material: aluminum alloy + #45 hardened steel The 2pcs wheel hex hub adaptor is 12mm hex diameter and 9mm thickness,rear wheel axle is 120mm, Ready to intall Package Include: 2pcs #45 steel rear wheel axle shaft and alloy 12mm wheel hex 2pcs Note: Check your specific model's manual for compatibility,or Contact us.