![GDS Racing Pro Mod1 5mm Bore Pinion Gear 27T Hardened Steel M1 27 Tooth RC Model](http://www.gds-racing.com/cdn/shop/products/1_4bfc9a6b-b61b-41db-9beb-e7d5897953f5_{width}x.jpg?v=1574454847)
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The gear was made of cased hardened 4340M Steel then nitridin the surface.
It has very tough core inside and high hardness on the surface for wearproof.
Specifics
27 Tooth
Face width: 8mm
Height: 15mm
Bore / hole size: 5mm
Outer Diameter: 29mm