1)series undercarriage 2)different sharp used for different earth condition 3) ... 1-3-5, D20, D30, D31, D50, D60, D85, D155 2) Hitachi: EX40, EX60, EX150, EX100M, EX100, EX120, EX150, ... EX200-1/2/3, EX300-1/3/5, EX400 3) Caterpillar: E110B, E312 ... : SH120, SH200, SH280, SH300, SH400 8) Mitsubishi: MS110, MS180 track links, track roller, rubber track shoes