Track roller,bottom roller,Lower roller 50Mn material High ability from oil leakage 6 months gurantee time PVC package Track Roller/bottom roller/lower roller/inferior roller/down roller for: KOMATSUPC400-5/6/7,PC360-7,PC300-5/6/7,PC300-1/2/3,PC220,PC200-5/6/7,PC200-3,PC200-1/2,PC120,PC100-6,PC100-5,PC100-1/2/3,PC75,PC60-7,PC60-5/6,PC50,PC45,PC40-7,PC30,PC20 CATERPILLARE450,E330C,E325,E322,E320C, ...