1) Eyelets 2) Metal eyelets 1) Eyelets 
Grommets are tiny ventilation tubes which may be surgically inserted into the ear drum to relieve chronic ear infections, in an operation known as tympanotomy or tympanostomy.
The design of grommets is critical to the acoustic performance of any partition such as engine bay bulkhead.Design Guidelines Grommets should be of soft material (natural rubber recommended by a supplier though may not be suitable for high temperature areas) to ensure consistent fit. Maximise grommet thickness. High contact area to hose/harness, us...