hammer
Implement consisting of a heavy ball attached to a wire; the athlete throws it after spinning around several times in the throwing circle.
head 
Spherical weight usually made of metal; it is the first part to strike the ground.
swivel 
Piece that connects the head to the wire and causes it to rotate.
handle 
Part that the athlete holds with two hands when throwing a hammer.
wire 
Steel wire connecting the head to the handle through the swivel.