... : Carburizing, hardening and tempering, nitriding, high frequency treatment, black of oxidation, zincing, nickelage. 6.Machine: CNC engine lathe ... shaper, hobbing machine, grinder. Detailed Product Descriptionsteel gear rack Material : C45,40Cr,S.S 304,etc specs:10 ... length:1000mm Moudle:2-25 steel gear rack Steel gear rack specs: 10*10*1000mmMaterialC45Typespurteeth finishcutprecisionup 5Product usage ...