Ordering Description Product number Description: OK Weartrode 55 3.2x450mm Product number: 8017324020 Description: OK Weartrode 55 4.0x450mm Product number: 8017404020 Description: OK Weartrode 55 5.0x450mm Product number: 8017504020 Description: OK Weartrode 55 6.0x450mm Product number: 8017604020