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 ("r",1) is then a ring homomorphism. In general, this is not injective; if "a" and "b" are two elements of "R" such that there exists "s" in "S" with , then their images under "j" are equal. The above-mentioned universal property is the following: the ring homomorphism "j" : "R" → "R*" maps every element of "S" to a unit in "R*", and if "f" : "R" → "T" is some other ring homomorphism which maps every element of "S" to a unit in "T", then there exists a unique ring homomorphism "g" : "R*" → "T" such that "f"