Shackles are a type of rigging fitting that’s used as an attachment component for lifts or suspension. NOTE: Refer to ASME B30.26 for all guidelines pertaining to overhead lifting and suspension. A common example of how shackle would be used is attaching a turnbuckle to an eyebolt. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.