Grommet be used purely decoratively for crafting. When used in sailing and various other applications, they are called cringles. Sometimes field workers refer to them as grunyons. If metal or another hard material has a hole made in it, the hole will probably have sharp edges. Electrical wires, cord, rope, lacings, or other soft vulnerable material passing through the hole can become abraded or cut, or electrical insulation may break due to repeated flexing at the exit point. Rubber, plastic or plastic coated metal grommets are used to avoid this. The grommet could also protect the wiring/cabling from contamination from dirt,
Localization of a ring is a ring of functions defined on some geometric object (algebraic variety) "V", and one wants to study this variety "locally" near a point "p", then one considers the set "S" of all functions that are not zero at "p" and localizes "R" with respect to "S". The resulting ring "R*" contains only information about the behavior of "V" near "p". For more detail, see Ring of germs. In number theory and algebraic topology, one refers to the behavior of a ring "at" a number "n" or "away" from "n". "Away from "n"" means "in the ring localized by the