Panama chock sometimes is called Panama bow, or Panama canal chock, because this kind of chock should be made as per requirements of Marine Director's notice of shipping n. 1-99 "Vessel requirements" part.8, issued by Panama Canal Commission in December 1999.Mooring chock is also called mooring pipe because it works as a pipe through which mooring rope can pass.
Deck Mounted Mooring Chock
EU Type Bulwark Towing Chock
Actually if you categorize chocks according to closed or open on shape, you can have closed chock and open chock. If to standard, there are JIS, DIN, Spanish standard, EU, GB, CB, etc. And if according to position on board, we can have two groups: Deck mounted chocks and Bulwark mounted chocks.
Panama Chock DIN 81915
Universal Closed Chock