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This Is Hardened Steel 19 20 21 22 Tooth, Mod 1 Pitch Pinion Gear For Motors With A 5Mm ShaftFeaturesCnc Machined- Hardened Steel To Increased Wear Resistance And Improve Fatigue LifeNitrided To Enhanced Hardness Corrosion ResistanceSpecifications:&Nbsp;Tooth Count: 19 20 21 22Tooth Pitch: Mod 1Toot..