This is a tripod socket for Sigma telephoto lenses. Includes the main body, instruction manual, anti-slip screw (attached), and two types of hex wrenches. Used a few times. Selling because I no longer need it. It was attached to a 150-600 F5-6.3 SPORTS lens. Please refrain from purchasing if you are sensitive to items stored at home. Thank you. TRIPOD SOCKET TS-101 Brand: Sigma