A shackle must be marked with all of the following except what?

A shackle is a crucial component in rigging. It is essential for safety and load management to ensure those who handle and use shackles are aware of their specifications. Shackles must be clearly marked with their working load limit, material type, and manufacturing date to provide critical information about their capacities and suitability for particular tasks.

The working load limit ensures that users know the maximum load the shackle can safely lift, while the material type indicates the composition of the shackle, which affects its strength and durability. The manufacturing date is important as it can give insights into the age of the equipment and its potential wear over time.

However, shackles are not required to be marked with the country of manufacture. While this information can be useful in certain contexts, such as for identifying compliant products or verifying quality standards, it is not a mandatory marking requirement. This is why the absence of the country of manufacturer from the required markings is correct.