The STI TAP RH 4-40 GH1 B from Field Tool Supply is a precision tap designed for creating internal threads in materials such as aluminum, brass, and steel. With a right-hand cutting design, this tap features a 4-40 thread size, making it ideal for small fasteners and intricate applications. Constructed from high-speed steel, it ensures durability and longevity, while the GH1 designation indicates a general-purpose thread form. This tap is compatible with standard tapping machines and hand tools, providing versatility for various projects. Dimensions and specifications are optimized for consistent performance, making it a reliable choice for both professionals and DIY enthusiasts.