What type of shackle is the most commonly used in rigging?

The screw pin bow type shackle is the most commonly used in rigging because of its versatility and reliability. This type of shackle features a pin that can be easily unscrewed, which allows for quick assembly and disassembly in various applications, making it ideal for rigging tasks that require frequent adjustments or changes in configuration.

Additionally, the shape of the bow allows for multi-directional loading and can accommodate various connections, such as ropes, chains, and other rigging hardware. The screw pin design also provides a secure closure, minimizing the risk of accidental opening under load, which is crucial for safety in rigging operations.

Overall, its ease of use, adaptability, and secure fastening make the screw pin bow type shackle a preferred choice among riggers.