Uxcell 21mm Outside Dia 2mm Thickness Rubber Oil Filter Seal Gasket O Rings (10 Piece), Black Product name : O ring; material : rubber Color : Black; outside diameter : 21Mm/0. 83" Inside diameter : 17Mm/0. 67"; thickness : 2Mm/0. 12" Weight : 1G Package Content : 10 pcs x O rings