Rubber Grommets are used for multiple projects.They're usually used to cover the rough and sharp edges of a hole in metal,wood. They also protect lines,wires and cables from chafing or grazing on rough surfaces.They also be used to reduce vibration and to seal different important under-the-hood and body applications on automobiles.

Measurements:

Inside Diameter:  3/4" (19mm)

Groove Width: 3/16" (4.8mm)

Fits Panel Size Holes:  1" (25.4mm)

Total Outside Diameter:  1-1/4" (31.8mm)

Overall Thickness:  9/16" (14.3mm)

Durometer hardness - 60 Can be used indoors or outdoors. Can be used to seal holes and many other uses.