Hard chrome plated hollow bar

hollow rod, actually a kind of seamless tube with thick wall, is mainly used to manufacture piston rod. Hard chrome plated hollow rod is used as hollow piston rods for hydraulic cylinders.  Chrome plated hollow rods are made from seamless tubes with hard chrome plating externally. 

Hollow Piston Rod Concrete Delivery Cylinder Seamless Square Tube Seamless Rectangular Tube Hollow Bar