ANCHOR SWIVEL SHACKLES The use of a swivel and joining shackles to join your anchor and rode will greatly improve anchor retrieval and help ensure that the rode lays neatly into your anchor locker. Thus, they are highly recommended for use with Maxwell's automatic rope/chain series windlasses. Two sizes (6mm - 8mm/1/4' - 5/16' and 10mm - 12mm/3/8' - 7/16') are available to suit vessels up to 20 metres (65'). These robust single swivel anchor connectors, with captured pins, will not loosen under load and pull smoothly and easily over bow rollers.