A pair of hydraulic posts used to contain the work wire or mooring chain within a restricted area at the stern of AHTS vessels. They are lifted from the deck and trap the wire inbetween themselves, some of these having plates on the top (elephant’s feet) which turn inwards, preventing the wire from escaping. Angled guide pins makes extra locking mechanism on top of pins unnecessary: when both pins are raised they close completely together at the top.