... use-life 2 Heattreatment & plating 3 OEM acceptable 4 Durable Motorcycle sprockets:1 General introductionSpecificationFront: 12T/13T/14T/15T/16T/17T ... ,420H, 428,428H,530Material:AISI1023, AISI1045, AISI52100Surface treatmentSand blasting, Galvanization, Chrome plating, Spraying, Knurling etc. Heat treatmentHigh frequency quenching, carburizationPackingBlister card ...