7/16" x 3/4" x 1/4" x 1/16" Black Rubber Grommets GRMTR-097 (15 pcs.)

Diameter: 7/16"
Diameter 2: 3/4"
Thickness: 1/4"
Material: Rubber
Finish: Black
Type: Grommet
Groove: 1/16"
GrooveDiameter: 9/16"
Groove: x 1/16"

Box of 15.

Grommets and eyelets are metal, plastic, or rubber 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.