The Spring Steel R Pins are made of spring steels, brass or stainless steel. Generally used with clevis pins, slotted nut, bore, shaft, wheel and other device for locking purpose. The material from which a spring pin is crafted is always an important consideration. Spring pins are made from alloy, carbon, and stainless steel. Carbon steel and alloy steel are both common economical materials. They are hollow, cylindrical tube style press fit fasteners with chamfered ends. Spring Steel R Pins are very useful