CM Alloy Shackles are designed with a 5:1 design factor and have a strength rating approximately 50% higher than a comparable-sized carbon shackle and about 25% stronger than Super Strong shackles. Anchor shackles can be side loaded or used for multiple connections. Bolt type anchor shackles--also know as "safety shackles"--provide the most secure pin arrangement and will resist axial loading and torsional loading, but should only be used in applications where shackle is infrequently or never removed. Made of Special Bar Quality (SBQ) steel having fine grain, reduced sulfur and phosphorus. These shackles will show major deformation before failure. Working Load Limit (WLL) and traceability codes shown as permanent markings on body, and all shackles have alloy quenched and tempered pins and a hot-dip galvanized finish. Shackles meet dimensional and performance requirements of RR-C-271. Special testing and certification is available upon request at the time of order. CM Smart ID RFID technology is available as an option on shackles sizes 3/4" to 1-3/4".