Listing is for One Rubber O Ring Made of Nitrile Rubber N3. 

The Outside Diameter = 60 Millimeters or ~2.362 inches or ~ 2 & 23/64th inches

The Inside Diameter = 54 Millimeters or ~ 2.126 inches or ~ 2 & 1/8th inches

The Thickness = 3 Millimeters or ~ .118 inches or ~ 1/8th inches

These Resist oils, hydraulic fluid and water.

Flexible Nitrile rubber O ring seal.

These O ring are used on automotive components, machinery components, medical and bathroom facilities, household electrical appliances and electronic instruments, etc.