Modelled and rendered with Maya 5.
Actually elegantly simple to model - I used a polygon sphere, selected all faces and extruded them.

For the rendering, I again used my simple "autofocus" expression. The iron dingus is 100 cm away from the camera. The virtual focul length is 75 mm, with an f-stop of 3.5.

I had to play with the iron spike's textures (adding and tweaking bump structure) until it looked OK.