The most basic chassis construction is called bolted and bonded. It uses a combination of adhesive and screws to join the basic pieces of the chassis together in order to provide structural integrity. These chassis consist of a minimum of four walls, any typically the side walls are designed to interface with the heat frames wedge locks and ejectors and serve as the primary method for extracting the heat from the heat frames and into the chassis. Depending upon the thermal requirements the sidewalls, and top wall may be covered with fins to help dissipate the heat in a natural or force convection environment. While the bolted and bonded chassis may provide a lower level of thermal and mechanical protection, it also has the advantage of being the least cost and fastest to production versus other manufacturing methods.