Shop › O-Ring Image 1 of 1 O-Ring $1.50 Oring is placed between lens and the scope housing to remove any vibration of the lens at the time of the shot. Size: 1.75" 2.00" 2.125" 2.25" Quantity: Add To Cart Added! Oring is placed between lens and the scope housing to remove any vibration of the lens at the time of the shot.