The TAP OP-2 UF(20)5/16-18 H3 B from Field Tool Supply is engineered for creating internal threads with a size of 5/16-18. Constructed from high-quality materials, this tap ensures durability and precision in various threading applications. The H3 tolerance provides a snug fit, making it ideal for mechanical and industrial tasks. Its robust design allows for efficient cutting through different materials, including metals and plastics. This tap is a must-have for both professionals and DIY enthusiasts, delivering reliable performance and ease of handling.