Long Stroke Spring Plungers Standard PJH Long Nose are used in a wide variety of applications where a push or pull force is required. These plungers are made of high quality materials and are designed for long term use. The spring inside the plunger provides the force required to push or pull the object being moved. The nose of the plunger is designed to fit into a hole or cavity in the object being moved, and the body of the plunger fits over the top of the object. The plunger can be locked in place by screwing the body of the plunger down onto the object.