Product review (4 stars): Very hard steel
Exactly what it claims to be.  The missing star is because the product description does not state the kind of steel this is.  I wanted to thread the ends, and the steel is too hard to cut with a hacksaw or thread with a die.  I'm sure that if I wanted an axle for a RC car, this product would fill my life with gladness and joy.  Because this claims only to be an RC axle, I cannot fault it too much for wanting it to be more than it is.