... treatment Carburizing, hardening and tempering, nitriding, heavy duty truck synchronizer hub Detailed Product Description ISO/TS 16949:2009 ZF Technology Match ... ,North Benz,Hongyan,etc. OEM parts Item Synchronizer body (for 3rd and 4th speed)Item No.1310 304 158Brand NameHYMaterial20CrMnTiBasic formForgingTechnologyZF ... JAC, Zonda, Daewoo, Neoplan, Kaisiboaer, etc. heavy duty truck synchronizer hub