Most of our fasteners have a light zinc plating over steel giving a more rust resistant finsh. Not all fasteners are applicable for all applications so be certain to test thouroughly and get the opinion of a licensed building or certified building or structural engineer before ...Most of our fasteners have a light zinc plating over steel giving a more rust resistant finsh. Not all fasteners are applicable for all applications so be certain to test thouroughly and get the opinion of a licensed building or certified building or structural engineer before relying on these fasteners for any situations where failure would result in damage to property or person.PROP 65 WARNING: This product can expose you to some kind of chemical, which is known to the State of California to cause cancer.