I looked up the word Stud, still not sure why we need one....
a large-headed piece of metal that pierces and projects from a surface, especially for decoration.
an item of jewelry in the form of a piece of metal, precious stone, or other ornament attached to a pin or shaft that passes through a piercing in the body.
a fastener consisting of two buttons joined with a bar, used in formal wear to fasten a shirtfront or to fasten a collar to a shirt.
British
a small projection fixed to the base of footwear, especially athletic shoes, to allow the wearer to grip the ground.
a small metal piece set into the tire of a motor vehicle to improve roadholding in slippery conditions