Anchor Shackle Scrw Pin 3/8 WARNING: Use shackles only as indicated. Shackles must be inspected for wear, distortion and damage before use. If the pin or bow is worn, distorted or damaged, discard the entire shackle and replace. DO NOT USE round pin shackles in rigging applications. Screw pin shackles should not be used if there will be movement on the pin. Movement could cause the pin to unscrew and drop the load. Always stand clear of loads being lifted.