JIS F2005-1975 Deck Mounted Marine Mooring Closed Chock Closed chock is one form of mooring chock which used to guide the mooring ropes.
Closed Chock Can be called 'bulwark chock', is located in the bulwarks, with closed hole shaped fairlead limit position of the cable are derived. Its basic shape is circular, oval,Do not know if you understand?