1.material.: 42CrMo4 forging 2. QT heat treament. 3. good mechanical properites. 4. economic 1.the material42CrMo4,C45,C60,Q345B,Q345D2.processprecise mould forging3.precisionEN10243-F4.quality controlprecision mould guarantee theh dimensions torlerance5.usageauto parts,hardware,metal parts,the other machinery parts6.heat treatmentQT7.human basedoutside is R