"D355A-3 front idler, OEM part no. 195-30-00283 195-30-00055 195-30-00470 " the front idler is our best product for the undercarriage parts biggest order in our factory every year . The quality was well received by the majority of customers  and we are sure the  warranty time  is 2000 hours. "The material is 40SiMnTi and the surface hardness is HRC48-54,deepth:4mm-10mm"use froging technique.