The Hot Racing Steel Mod 1 Pinion Gear is compatible with 1/8 and 1/10 Scale Cars that use Mod 1 Gearing. Pinion has a 5mm bore, and is only compatible with motors that have a 5mm motor shaft. Choose tooth count from the pull down menu above.

Features:

• Hardened steel construction
• Black in color
• Includes Mod-1 Pinion Gear and 4x4mm Set Screw

Specifications:
Length: 12mm (0.47")
Inner diameter: 5mm (0.20")