A shackle is a U-shaped piece of metal secured with a clevis pin or bolt across the opening. They are used to make connections to slings, rope, cable, etc. Shackles ...

Another critical factor is the material. D ring shackles are typically made of steel, stainless steel, or aluminum. Steel shackles are the most common and affordable, but they can rust over time.

Specialized shackles may carry additional specifications or provide optional features. For example, stainless steel screw-pin anchor shackles provide improved corrosion and chemical resistance.