SF Industrial Stainless Steel Screw Pin Anchor Shackle - Choose 3/16", 1/4" or 3/8" - Grade 316 SS Premium quality stainless steel hardware suitable for marine & other harsh conditions Grade 316 stainless steel has superior corrosion resistance and strength over grade 304 Choose size (leg diameter) from 3/16", 1/4" or 3/8" - see description for specifications Threaded shackle pin with key hole for tightening/loosening Electronic polishing has bright finish without thread-strength degradation of mirror finish process