Fasteners play a critical role in the construction of all sorts of everyday objects. If you¡¯ve done any DIY projects, you¡¯ve likely used fasteners to help get the job done.Fasteners are used for fastening and securing materials such as wood, metal, plastic, or concrete. They include nuts and bolts, threaded rods, structural bolts, machine screws, wedge anchors, washers, rivets, and more in a variety of types and sizes, including metric and inch.