Popular Japanese wheel steel seat. Zinc or black zinc plated.
Steel wheel nut seat, hardened and nickel plated.
Fits most popular Japanese wheels.
Large outer diameter- 28.4mm.
Small splined outer diameter- 19.5mm (this should be an interference fit)
Overall height- 11.26mm
Base to base of cone- 6.1mm
height of conical section- 5.16mm