Drilled and milled

it is said about the steering wheel:
DRILLED AND MILLED OUT OF A SOLID ALUMINUM BLOCK

What does it mean drilled and milled, I found this combination a lot in google.

Thank you very much

To make it simple: the steering wheel is "cut" out of an aluminum block with machine tools.

Thank you very much!

You were asking lately in another post for the meaning of "run a dino", which has been answered by Rube, but if you want to know more about it, check out this site www.stuskadynamometer.com/