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Grommets and eyelets are metal
Metal

In chemistry, a metal is a chemical element whose atoms readily lose electrons to form positive ions , and form metallic bonds between other metal atoms and ionic bonds between nonmetal atoms....
, plastic
Plastic

Plastic is the general common term for a wide range of synthetic or semisynthetic organic chemistry solid materials suitable for the manufacture of industrial products....
, or rubber
Rubber

Natural rubber is an elastomer?an Elasticity_ hydrocarbon polymer?that was originally derived from a milky colloidal suspension, or latex , found in the sap of some plants....
 rings that are inserted into a hole made through another material.






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Rubbergrommets
Eyelet
Grommets and eyelets are metal
Metal

In chemistry, a metal is a chemical element whose atoms readily lose electrons to form positive ions , and form metallic bonds between other metal atoms and ionic bonds between nonmetal atoms....
, plastic
Plastic

Plastic is the general common term for a wide range of synthetic or semisynthetic organic chemistry solid materials suitable for the manufacture of industrial products....
, or rubber
Rubber

Natural rubber is an elastomer?an Elasticity_ hydrocarbon polymer?that was originally derived from a milky colloidal suspension, or latex , found in the sap of some plants....
 rings that are inserted into a hole made through another material. They may be used to reinforce the hole, to shield something from the sharp edges of the hole, or both.

Grommets as reinforcement or crafting

Grommets are used to reinforce holes in leather
Leather

Leather is a material created through the tanning of rawhides and skins of animals, primarily cattlehide. The tanning process converts the putrescible skin into a durable, long-lasting and versatile natural material for various uses....
, clothing
Clothing

A feature of all human societies, except perhaps the most primitive, is the wearing of clothing or clothes, especially in public. The primary purpose of clothing is functional, as a protection from the weather....
, shoes, and other fabric
Textile

A textile is a flexible material consisting of a network of natural or artificial fibres often referred to as thread or yarn. Yarn is produced by Spinning raw wool fibres, linen, cotton, or other material on a spinning wheel to produce long strands known as yarn....
s. They can be made of metal
Metal

In chemistry, a metal is a chemical element whose atoms readily lose electrons to form positive ions , and form metallic bonds between other metal atoms and ionic bonds between nonmetal atoms....
 or plastic
Plastic

Plastic is the general common term for a wide range of synthetic or semisynthetic organic chemistry solid materials suitable for the manufacture of industrial products....
, and are easily used in common projects, requiring only the grommet itself, a grommet-setting tool
Tool

A broad definition of a tool is an entity used to interface between two or more domains that facilitates more effective action of one domain upon the other....
 (a metal rod with a convex tip usually sold with the grommets), and a hammer
Hammer

A hammer is a tool meant to deliver an impact to an object. The most common uses are for driving Nail s, fitting parts, and breaking up objects....
. Higher end grommet presses (as shown in the picture) exist as well, though generally a hammer and the grommet-setting tool is equally effective for small projects. Their most common usage is to strengthen the holes for bootlacing but they are also good for making corset
Corset

A corset is a garment worn to mold and shape the torso into a desired shape for aesthetic or medical purposes . Both men and women are known to wear corsets, though women are more common wearers....
s and other laced clothing, plus curtains and other household items that require hanging from hooks. The grommet prevents the cord from tearing through the hole, thereby providing structural integrity. Small grommets are also called eyelets, especially when used in clothing or crafting. When using eyelets for crafting, they are generally used decoratively.

Grommets used as shielding

If metal or another hard material has a hole made in it, the hole may have sharp edges. Electrical
Electricity

Electricity is a general term that encompasses a variety of phenomena resulting from the presence and flow of electric charge. These include many easily recognizable phenomena such as lightning and static electricity, but in addition, less familiar concepts such as the electromagnetic field and electromagnetic induction....
 wire
Wire

A wire is a single, usually cylinder , elongated string of metal. Wires are used to bear mechanical Structural loads and to carry electricity and telecommunications Wiktionary:signal....
s, cord
Cord

Cord may refer to:* String or rope* Cord , a trimming made of multiple strands of yarn twisted together* The spinal cord* Cord Automobile, a former American car marque founded by Errett Lobban Cord...
, rope
Rope

A rope is a length of fibers, twisted or braided together to improve strength for pulling and connecting. It has tensile strength but is too flexible to provide compressive strength ....
, lacings, or other soft vulnerable material passing through the hole can become abraded
Abrasion

In dermatology, an abrasion is a wound caused by superficial damage to the skin, no deeper than the Epidermis . It is less severe than a laceration, and bleeding, if present, is minimal....
 or cut, resulting in damage. Rubber, plastic or plastic coated metal grommets are each used to avoid this. The smooth and sometimes soft inner surface of the grommet shields the wire from damage.

Grommets are generally used whenever wires pass through punched sheet metal
Sheet metal

Sheet metal is simply metal formed into thin and flat pieces. It is one of the fundamental forms used in metalworking, and can be cut and bent into a variety of different shapes....
 for this reason. Molded and continuous strip grommets are manufactured in a wide variety of sizes and lengths expressly for this purpose; they are usually a single piece which can be inserted by hand. Two-piece hard plastic devices are available which also grip the wire that passes through. This is called strain relief and is often used on power supply cords that attach to a piece of equipment, to prevent a tug on the wire from stressing the electrical connections inside the equipment. Sometimes field workers may refer to grommets as grunyons.

Surgical grommets

In chronic cases of Otitis media
Otitis media

Otitis media is inflammation of the middle ear, or middle ear infection .Otitis media occurs in the area between the ear drum and the inner ear, including a duct known as the Eustachian tube....
 with effusions present for months, surgery is sometimes performed to insert a grommet, called a "tympanostomy tube
Tympanostomy tube

A tympanostomy tube is a small tube inserted into the eardrum in order to keep the middle ear aerated for a prolonged period of time, and to prevent the accumulation of mucus in the middle ear....
" into the eardrum
Eardrum

The tympanic membrane , is a thin biological membrane that separates the external ear from the middle ear. Its function is to transmit sound from the air to the ossicles inside the middle ear....
 to allow air to pass through into the middle ear, and thus release any pressure buildup and help clear excess fluid within. This is also a correcting measure for a patulous Eustachian tube
Eustachian tube

The Eustachian tube is a tube that links the pharynx to the middle ear. In adults the Eustachian tube is approximately 35 mm long. It is named after the sixteenth century anatomist Bartolomeo Eustachi....
 (when air moves to and from the middle ear with each breath making the eardrum flap).

See also

Stent
Stent

In medicine, a stent is a man-made 'tube' inserted into a natural passage/conduit in the body to prevent, or counteract, a disease-induced, localized flow constriction....
 Tympanostomy tube
Tympanostomy tube

A tympanostomy tube is a small tube inserted into the eardrum in order to keep the middle ear aerated for a prolonged period of time, and to prevent the accumulation of mucus in the middle ear....