Selecting a Wichard shackle is the choice for safety. Drop forged for superior strength, every genuine Wichard shackle is easily recognized by our signature "W-in-a-pentagon" insignia stamped on every part. The self locking pin is designed for safety. Small indentations in the shackle engage the head of the pin. Final tightening then creates the tension that locks the pin in place. Even the most violent vibrations will not loosen the pin. Wichards innovative captive pin range has been designed to enable better handling with added safety because the pin simply cannot be lost. Our captive pin shackles also have the patented self locking feature.