National Hardware N223-016 3150BC Quick Links in Zinc, 3/16" Authorized Replacement for Stanley Hardware Stock #S647-340 Manufactured from stainless steel Passivated for superior corrosion resistance Excellent for marine and other outdoor applications LifeSpan Limited Lifetime Warranty Links are for quick, sure connections without lock Manufactured from stainless steel Passivized for superior corrosion resistance Excellent for marine and other outdoor applications LifeSpan Limited Lifetime Warranty Links are for quick, sure connections without lock