A fastening pin is a type of hardware used to join two or more objects together. It can come in many forms, such as a PEG, DOWEL, RIVET, or COTTER. A PEG is a short cylindrical piece of wood or metal that is used to hold an object in place. A DOWEL is a cylindrical rod made of wood, metal, or plastic that is used to join two pieces of material together. A RIVET is a metal pin with a head on one end that is inserted into two pieces of material and then hammered down to secure them together. A COTTER is a metal pin with a split end that is inserted into two pieces of material and then bent over to secure them together. All of these fastening pins are used to securely join two or more objects together.