Pocket tube and shock absorber including the same

A shock absorber comprising:

• a pressure tube configured to define a chamber that extends vertically and is filled with a working fluid;
• a rod configured to extend into an interior of the pressure tube;
• a piston coupled to the rod and disposed in the chamber to divide the chamber into a lower chamber and an upper chamber;
• a hydraulic stopper ring coupled to an outer circumferential surface of the rod above the piston;
• and
• a pocket tube disposed in the upper chamber such that the hydraulic stopper ring enters the pocket tube during a rebound stroke in which the piston moves toward the upper chamber,
• wherein the pocket tube comprises:
• a first tube body configured to have a first outer diameter;
• a second tube body configured to have a second outer diameter smaller than the first outer diameter, the second tube body being coaxially connected to one axial end of the first tube body and extending therefrom;
• and
• at least one through-hole configured to penetrate both an inner circumferential surface and an outer circumferential surface of the second tube body.