3/8" x 3/4" x 1/2" Black Rubber Grommets (12 pcs.)

Diameter: 3/8"
Diameter 2: 3/4"
Thickness: 1/2"
Material: Rubber
Finish: Black
Style: Knock-Out Bushing
Type: Grommet
GrooveDiameter: 1/2"
Groove: x 1/2"

Box of 12.

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.