Fastening hardware is a type of hardware used to join two or more objects together. Tacks, which are five-letter words, are small metal pins with a sharp point at one end and a flat head at the other. They are used to attach fabric, paper, or thin wood to a surface. RIVETS, which are six-letter words, are cylindrical metal fasteners that are inserted into pre-drilled holes in two or more pieces of material and then secured with a special tool. They are used to join thicker materials such as metal or plastic. Both tacks and RIVETS are commonly used in construction and manufacturing.