Here are the replacement wheel hexes for many popular RC4WD axles. These fit on most axles except the Bully line. (Please see the photos to help confirm)
Specifications: 12mm Hex CNC Machined
Whats Included: 4x RC4WD 12mm Axle Wheel Hexes (2 Way) 4x RC4WD 12mm Axle Wheel Hexes (2 Way) pin Notes: These will not fit the RC4WD Bully axles.