This is a Traxxas M0.8P, 52T Spur Gear.
FEATURES:
M0.8 pitch
52 tooth
Black plastic construction
Compatible with 32P pinion gears
INCLUDES: One M0.8P, 52T Spur Gear
SPECS:
Pitch: M0.8
Tooth: 50
Outer Diameter: 43mm (1.69")
Inner Diameter: 11mm (0.43")