Construction fasteners are used to join two or more materials together. A RIVET is a type of construction fastener that consists of a smooth cylindrical shaft with a head on one end and a tail on the other. The tail is inserted into a hole in the material and then the head is hammered down, which causes the tail to expand and form a secure connection. A tnut is another type of construction fastener that has a threaded body and a flange at one end. It is inserted into a hole in the material and then secured with a nut. Both rivets and tnuts are commonly used in construction projects.