Tappet,roller,cold forgings,cold forged,cold extrusion,tappet (roller) parts Product Specification: Φ20 - Φ50 Material: 20CrMn, 20CrMo,16MnCr15 Surface Finish: Ra0.63 - Ra0.16 Size Precision: Grade IT8 - IT10 Product Application: Camshaft Mechanism of Diesel Engine