TR509 4-3/4" 90° tubeless tire valve is made of Nickel-Plated brass and is used in drop-center aluminum disc wheels with a .625 valve hole. The valve has a rubber grommet and comes with the valve cap. Specs: Nickel Plated Truck Valve - 0.45 + 4.75 in. 90 Deg. Angle - Rim Hole 0.625 in.