Product Description: Our National Pipe Taper (NPT) taps offer a comprehensive solution for various pipe threading requirements. These specialized taps are perfectly suited for the task of cleaning or re-threading pipes that have become stuck or damaged. Features: This NPT tap set includes 5 popular tap sizes: 3/4", 1/2", 3/8", 1/4", and 1/8". The size is nominal, rather than the actual diameter dimension of the tap. When selecting a tap, you would choose one with the same nominal size as the pipe fitting you intend to thread or create threads in. With this range of sizes, you can easily tackle a wide variety of projects. The NPT taps come neatly packed in a sleek plastic case, offering protection against rust and enabling easy storage and quick access to your pipe threading tools. Engineered with a right-hand cutting type, round shank, square end, and 4 straight flutes, these NPT taps ensure precise and efficient pipe threading. Whether you're working on plumbing installations, automotive repairs, or construction projects, these taps will deliver excellent results. They are suitable for both DIY plumbing and professional plumbing equipment. Specifications: The NPT thread design provides a tapered form that creates a solid and leak-free connection between pipes and fittings. The NPT thread specifications for each size are as follows: The 1/8" NPT tap has a threading density of 27 threads per inch. The 1/4" NPT tap has a threading density of 18 threads per inch. The 3/8" NPT tap has a threading density of 18 threads per inch. The 1/2" NPT tap has a threading density of 14 threads per inch The 3/4" NPT tap has a threading density of 14 threads per inch.