A turbine-shaped hubcap for Lego Technic Racing Medium wheels (56x34mm).
This version has no mounting axle included to increase mounting versatility. It will fit on wheels mounted to the car by axles instead of the connector hubs.
Right-hand version. See separate left-hand version to complete the set.
Update: I received this at my home. Its center hole fits over a Technic axle very well, but it's a little bit loose. Use a 1/2 bushing to hold it in place (that's what I designed the recess in the center for).