Also called roll pins，Coiled spring pins are rolled of band material420-545 HV，Generally, heavy duty Coiled Spring，Professional Toothed Slotted Spring Lock Pin，Spiral spring pins，Coiled spring pinsA spring pin also called roll pinis is considered a self retaining fastener.Also known as hitch pin clips and R-clips，Zinc-plated steel pins ， stainless steel pins.We are spring pin experts