... ,clean finish 1.Product Information: DescriptionCaterpillar excavator track roller E330BrandQYMaterial50MnFinishSmoothTechnologyForging,CastingSurface Hardness HRC52-58 ... bottom roller/lower roller/supporting roller for excavator and bulldozer.Wheel body precision forged, ... Hyundai, Volvo,Kobelco ,Sumsung ,Mitsubishi, Kato,Kubota, Caterpillar, Hitachi, Yuchai and so on.CaterpillarE70B E120B E200B ...