The STI TAP SP 5/16-18 GH4 P from Field Tool Supply is a specialized tap designed for precision threading. With a 5/16-18 thread size, this tap is perfect for creating strong, reliable threads in various materials. Made in the USA, it features a GH4 classification, indicating its suitability for specific applications requiring tighter tolerances. Constructed from high-speed steel, it ensures longevity and performance. This tap is ideal for use in automotive, manufacturing, and repair applications, making it a versatile addition to any toolkit.