A Fillister Head Screw, also known as a cheese head screw, is used to flush with the surface of the material it is being fastened to. Fillister head screws in junction box, because it provides a secure fastening without creating a snag hazard.Attributes:• Manufactured to precise specifications and are built for durability and reliability• Prevent electrical hazards, such as arcing and sparkingApplications:A Fillister Head Screw is used to provide a secure fastening for the junction box cover, preventing it from coming loose and exposing the electrical components inside.