Crosby® Screw Pin Sling Saver Shackle | S-253 - 1"- 3.25 TonCrosby S 253 3. 25 Ton Web Sling Shackles Designed for Synthetic Sling Performance The Crosby S 253 Web Sling Shackle is purpose built for use with web and round slings, featuring a squared off bow that improves load distribution and sling alignment. This specialized shape helps eliminate bunching and enables the sling to maintain its full Working Load Limit, increasing lifting efficiency by at least 15% compared to standard anchor or chain shackles.