The new indexing plungers from J.W. Winco have a threaded steel body with a plunger pin of hardened and ground steel, and a nonremovable knob of glass fiber reinforced nylon plastic in matte black. Available with or without a steel black oxide finish lock nut, the plungers are used for applications where the plunger is required to stay in a retracted position. The body’s head is provided with a suitable notch in opposite positions to prevent it from accidentally slipping back to its forward position. 800/877-8351