screw is a type of fastener, somewhat similar to a bolt, typically made of metal, and characterized by a helical ridge, known as an external thread. Screws are used to fasten materials by digging and wedging into the material when turned, while the thread cuts grooves in the fastened material that can help pull the fastened materials together and prevent them from being removed. A screw drive is a system used to turn a screw. At a minimum, it is a set of shaped cavities and projections in the screw head that allows torque to be applied to it. It usually also involves an attaching tool, such as a screwdriver, that is used to turn it. Other examples include Phillips-head screws and screwdrivers and Allen hex screws and wrenches. A plug is an implement or device used to close or open, or protect an opening, hose, drain, etc. A plug position may be absolutely or variably adjusted. Specifications: Height: 0.25 in. Width: 0.45 in. Length: 0.4 in. ?