Shackles come in a variety of styles and types. The anchor shackle being the most popular style and comes with different pin options.

HDG Screw Pin Anchor Shackles
Shackles are used as a connectors for slings, chains, ropes, and wire rope. Because the pins in them are removable, they are an important accessory for a variety of jobs in the rigging, towing, lifting, hoisting, and pulling applications.