The TAP LH (020) 5/16-18 GH3 T from Field Tool Supply is a left-hand tap designed for creating internal threads in various materials. With a thread size of 5/16-18, this tap is perfect for specialized applications where reverse threading is required. Made from high-speed steel, it provides excellent durability and cutting performance. The GH3 classification ensures optimal cutting efficiency, making it suitable for use in a variety of materials including metals and plastics. This tap is a must-have for any machinist or DIY enthusiast looking to expand their threading capabilities.