Spring-loaded plunger that locks in retracted position. To lock, pull knurled knob back and turn 90.

Spring-loaded plunger that locks in retracted position. To lock, pull knurled knob back and turn 90°. Standard plunger has a slight taper on plunger tip for easy alignment. Also available with a radiused Delrin plunger (slightly larger plunger diameter and lighter spring force). Available in steel or stainless steel.