These Ball and Spring Index Plungers are manufactured in mild steel or stainless steel. The ball and spring are embedded within the threaded cylinder for ease of application possibilities where accuracy and ease of use are the key factors. The Plunger also has a slotted head fitting most screw drivers for ease of insertion. Used for locating, positioning, and rapid adjustment of all kinds of tables, platforms, conveyors, gym equipment, catering equipment and fixtures.