A screw tap, also known as a thread tap, is a cutting tool used to create threads, or helical ridges, on the inside surface of a hole or opening in a material such as metal or plastic. The screw tap is typically made of high-speed steel or carbide and features a pointed end with flutes or grooves that guide the cutting action of the tap as it rotates into the material. The tap is turned by a tap wrench or tap handle, which applies downward pressure and helps to ensure that the tap stays aligned with the hole. Screw taps are commonly used in manufacturing and fabrication processes to create threaded holes for screws, bolts, and other fasteners.