1. VERSATILE NPT THREADS: The NPT pipe tap set offers multiple sizes to meet various pipe threading needs. It includes 5 sizes: 3/4 inch, 1/2 inch, 3/8 inch, 1/4 inch, and 1/8 inch. The nominal size of the tap corresponds to the size of the pipe fitting to be threaded. 2. PRECISE THREAD CUTTING: NPT taps feature precisely ground teeth with a rightcutting type, square end, and 4 straight flutes. These characteristics ensure accuracy and efficiency in pipe threading. 3. CARBON STEEL CONSTRUCTION: This durable pipe tap set is made of quality carbon steel, designed for clean and efficient internal thread cutting. It is ideal for cleaning or rethreading clogged or damaged pipes. 4. ORGANIZED AND PROTECTED: For convenience, the 5piece NPT pipe taps are neatly housed in a sturdy plastic case. This protects them from rust and keeps them wellorganized and easily accessible when threading tools are needed.