Rivets are considered to be permanent fasteners. It also called mechanical fasteners. It consists of a smooth cylindrical shaft with a head on one end. The head in the opposite end is called the buck-tail. On installation the rivet is placed in a pre-drilled hole. Then the tail is upset so that it expands to about 1.5 times the original shaft diameter and holds the rivet in place. To distinguish between the two ends of the rivet, the original head is called the factory head and the deformed end is called the buck-tail.