This is a pair of Vanquish Products SLW 725 Wheel Hubs.
Diameter: 0.87" (22mm)
Thickness: 0.83" (21mm)
2x SLW 725 Wheel Hubs
6x 4-40 screws per hub to attach hub to wheel
The Losi Rock Rey and Losi Baja Rey require the use of non-flanged 5mm wheel nut.