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 Localization of a ring In commutative algebra, localization is a systematic method of adding multiplicative inverses to a ring. Given a ring "R" and a subset "S", one wants to construct some ring "R*" and ring homomorphism from "R" to "R*", such that the image of "S" consists of "units" (invertible elements) in "R*". Further one wants "R*" to be the 'best possible' or 'most general' way to do this—in the usual fashion this should be expressed by a universal property. The localization of "R" by "S" is usually denoted by "S""R"; however other notations are used in some important