Uxcell Replacement Black Rubber O Rings Oil Seal Washers (20 Piece), 30mm x 27mm x 1.5mm Product name : Oil seal ring; external diameter : 30Mm/1. 2" Inner diameter : 27Mm/1"; thickness : 1. 5Mm/0. 06" Material : rubber; color : Black Weight : 5G Package Content : 20 pcs x Oil seal ring