This roller is used for KOMATSU excavator, the roller body material is 40Mn or 50Mn, the shaft diameter is ⊘30mm, the roller body length is 102mm, the height is 73mm,beside, we also can offer this model track roller, sprocket, idler, track link etc undercarriage parts for this model. KTS factory professional produce high quality excavator parts for many years, special 1-6ton mini-excavator undercarriage parts, not only can be used in steel tracks, also can be used in rubber tracks, our products are according to the standard of OEM to manufacture.