The TAP OP-3 UF(20) 5/16-18 H3 P from Field Tool Supply is a high-quality tap designed for precision threading in various materials. This tap features a 5/16-18 thread size, making it ideal for a range of applications in metalworking and manufacturing. Constructed from durable materials, it ensures longevity and reliability. The H3 classification indicates a high tolerance for precision work, suitable for professional use. With a length optimized for ease of use, this tap is compatible with standard threading machines and hand tools, making it versatile for both industrial and DIY projects.