Metallurgy oil cylinder Aluminium, steel, bronze material ISO9001:2008 approved OEM service,CNC machining Weight:50kg-200kg CompanyDalian Wills Machine Co.,LtdProduct nameMetallurgy oil cylinderMaterialSteel,20#,45#,Aluminium, bronzeComposeHydraulic body, Hydraulic piston, Hydraulic RodHydraulic clinder typesPiston,plunger,piston, telescopic,SwingoutInside Surface roughnessRa 0.4---0.8& ...