2 Sets 4pcs OEM Seals for a 18lb Vibratory Tumbler. Works with Harbor Freight, Eastwood and others. Included 2 rubber seals and 2 steel washers. Steel Washer 50mm / 1-15/16 Dia, 11mm center hole. Rubber Washer 50mm / 1-15/16 Dia 11mm center hole, 4mm thick