This is an optional Hot Racing 56 Tooth, 32 Pitch Steel Super Duty Spur Gear, for use with the 1/10th scale Axial electric Wraith, AX10, and SCX series trucks.
Number of Teeth: 56
Internal diameter: 0.39 inch (9.9mm)
Gear Pitch: 32 pitch (0.8 module)
Mounting Holes: 3
Tooth Face width: 0.20 inch (5mm)