A cast iron hook was made for lifting heavy loads in a marine or warehouse environment. The hook would be attached to the end of a chain or rope around a heavy load such as a pallet or container. The other end may have been joined to a pulley or crane for lifting and moving it around. The inscription on the hook shows the SWL or Safe Working Load as 3 Ton. The SWL was used in the industry for many years to rate safe loads but it is no longer used to identify the maximum capacity of equipment. In 2002 the Australian Standard AS 1418 for Cranes, Hoists and Winches changed, and the term Safe Work Load was changed to Rated Capacity, which was defined differently.The hook represents the equipment needed on a ship or at a port, railyard, transport depot or warehouse in the 19th and 20th centuries to move cargo and loads. The inscription of SWL on the hook is significant for its use as a guide for many years to work out the weight of the load the hook could safely hold. However, time and experience have led to a change in Australian Standards and the load is now measured by another formula that gives the load's Rated Capacity.Hook; large iron hook with a ring formed in the top. Inscription stamped into the metal and indicates that the Safe Working Load (SWL) for the hook to lift is 3 Ton.Marked "ani" "SWL 3TON"warrnambool, shipwreck coast, flagstaff hill, flagstaff hill maritime museum, flagstaff hill maritime village, lifting hook, maritime equipment, lifting equipment, warehousing, cargo, loads, rigging, marine technology, swl, safe working load, 3 ton, rated capacity, load limit

Chain shackles are used in lifting and static systems as removable links to connect wire rope. Screw pin schackles are used mainly for non-permanent applications. SWL - safe working limit Cwt - 100 lbs. American. 112 lbs. BritishSWL 60 Cwttie down, towing, suspension, lifting