Fasteners are connections that are used to connect two parts or process by the use of threading. The thread is incorporated into the appliance or system where it is used. It is generally very industrious and strong and cannot be easily removed unless used with a special device such as screw. In choosing a fastener it is very important to choose a fastener of the right material. Different material fasteners have different advantages and disadvantages. Some may be suitable to certain environments while others may be vulnerable in those environments. It is important to choose the fastener you require according to the environment in which you choose to implement them to avoid the formation of corrosion in the fasteners.