Shape: Rack Gear Place of Origin: Tianjin, China (Mainland) Model Number: M2 Brand Name: OEM/ODM Material: Steel, C45 steel Processing: Forging Standard or Nonstandard: Standard Teeth: Hardened Model number: M1-M12 Hub and keyway: According to your requirement Color: as you like Surface treatment: Carbonization Application: Transmission Device Usage: Construction Hoist Spare Parts Tooth Profile: Helical Rack precision: DIN6,DIN7,DIN8