Grommets are rings or edge strips that are inserted into a hole through thin material, such as textile fabric, sheet metal, or composite materials like carbon fiber, wood, or honeycomb. They are generally flared or collared on each side to keep them in place. Grommets are used to reinforce holes in leather, cloth, shoes, canvas, and other fabrics. They can be made of metal, rubber, or plastic, and are easily used in common projects, requiring only the grommet itself and a means of setting it. Grommets are typically used in the following applications:

• Footwear for boot and shoe laces
• Laced clothing such as corsets
• Flags for hoisting
• Curtains and other household items that require hanging from hooks, as when they are used in conjunction with tensioner rods for shower curtains

Grommets prevent the cord from tearing through the hole, thereby providing structural integrity. Small grommets are also called eyelets, especially when used in clothing or crafting. Grommets are also used to protect holes in thin materials like fabrics, sheet metal, and carbon fiber, so that wires, rope, or cords can be put through the material without tearing through or misshaping the hole. Grommets are necessary when hole reinforcement is needed to prevent fraying. Grommets can be made of a variety of materials and in many different sizes with varying hole diameters. They can be used in tents and tarps, industrial covers, boat covers and other marine uses, custom awnings, shade sails, vinyl banners and flags, grommet curtains, drapery, outdoor upholstery, and more. Grommets are also used in ear surgical procedures and electrical work.