Socket set screw is a type of fastener that is commonly used to secure one object within another object without the need for a nut. It consists of a small cylindrical rod with threads along its length and a socket or hexagonal drive at one end. The socket or drive is designed to fit a corresponding tool, such as a hex wrench, that is used to tighten or loosen the screw. Socket set screws are typically made from steel, stainless steel, or other materials that are strong and durable, and they come in a variety of sizes and thread types. They are commonly used to secure parts such as gears, pulleys, and other components in machinery and equipment, as well as in construction, woodworking, and other applications where a strong and secure connection is needed.