What is the term for the metal ring located at the bottom of a block?

The term for the metal ring located at the bottom of a block is the becket. In nautical terminology, a becket serves as a loop or fitting that provides a means for securing the block to a line or other rigging components. This is crucial for the functional operation of the block, as it allows for easy attachment and detachment while also ensuring that the block remains securely fastened during use.

Understanding the function of a becket is important for rigging and sail handling, as it aids in the overall efficiency of moving loads. The other choices represent different components or concepts in nautical contexts, but they do not relate to the specific feature that defines the bottom portion of a block. For example, a sheave refers to the grooved wheel inside a block that holds the line, while a hitch is a knot used for securing lines. An anchor is a device used to moor a vessel to the seabed. Each of these items has its own distinct function, but when specifically discussing the metal ring on a block, the becket is the correct term.