Track Roller Material:50MN Guarantee:6 month 1,Product InformationReplacement parts of track roller for Caterpillar,Komatsu,Hitachi,Kobelco,Mitsubishi,Sumitomo,Daewoo, ... only.we do not imply that these items are products of the OEM 2,Certification:ISO9001:2000 3,Products Series & Advantages ...