5PCS RC Tug Boat Motor Shaft Inner Diameter 3/4/5/6/8/10/12mm Nitrile Rubber Sealing Ring Speed Drive Axle Oil Water Seals Item name: Skeleton sealing ring Material: Nitrile rubber Resistant to oil, water, and dust Sealing method: Seal Working temperature: -259°C to +100°C Working pressure: 0. 3bar Rubber hardness: 70° (SHA) Sizes: - Inner diameter 3mm, outer diameter 9mm, height 4mm - Inner diameter 4mm, outer diameter 11mm, height 4mm - Inner diameter 5mm, outer diameter 12mm, height 5mm - Inner diameter 6mm, outer diameter 15mm, height 5mm - Inner diameter 8mm, outer diameter 16mm, height 5mm - Inner diameter 10mm, outer diameter 21mm, height 6mm - Inner diameter 12mm, outer diameter 24mm, height 7mm Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.