5/16" x 9/16" x 1/8" Rubber O-Rings

Diameter: 5/16"
Diameter 2: 9/16"
Thickness: 1/8"
Material: Rubber
Nominal Size: #203
Type: O-Ring

Box of 10.

An O-ring is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a disc-shaped cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface.