... We are specelized in Excavator Parts Hydraulic cylinder assembly and Cylinder Parts (Excavator parts Hydraulic Cylinder Assy,Barrel, ... Komatsu,Hitachi,Kato,Caterpillar,Daewoo,Hyundai,Kobelco,Sumitomo,Volvo,Mitsubishi and etc excavators. 2.Feature:ApplicationExcavator Hydraulic CylinderMaterial45# Steel ... :2008 & SGS)4.Exhibition4.Stock excavator boom cylinder and arm/stick cylinder or bucket cylinders