With their rounded shape bow shackles are designed to handle many different types of load from any direction. Constructed of hot dip galvanized drop forged steel these shackles feature a screw pin closure and are ideal for joining anchors to mooring chain. These Screw Pin Anchor Shackles are forged to comply with Federal Spec. RR-C-271b and are load rated. Pin 5/16" Max Load 3/4 ton