These Nylon Insert Lock Nuts in 18-8/304 Stainless Steel are designed to be used where you don't want the possibility of the fastener becoming loose due to Vibration, Shrinkage or application. Made from 18-8/304 Stainless Steel, these Nylon Insert Lock Nuts are the choice for most marine, industrial, construction and OEM applications where corrosion resistance is a primary factor.