From The Manufacturerthis Is The 5Mm Hardened Steel Motor Pinion Gear 20T By Much More Racing. Made Of Steel. One Pinion Gear One Setscrew, M4X3Mm.FeaturesFeatures: Made Of SteelIncludes: One Pinion Gear One Setscrew, M4X3MmIncludes: One Pinion Gear One Setscrew, M4X3MmSpecificationProduct DetailDim..