Amanaote 304 Stainless Steel Shackle Standard Size M5 Screw Pin D Anchor Shackle D Ring (Pack Of 10) Shackle type: Standard 304 stainless steel hardware suitable for marine & other harsh conditions Threaded shackle pin with key hole for tightening/loosening Electronic polishing has bright finish without thread-strength degradation of mirror finish process Standard Size:M5