The Grainger website features internal threading taps used for creating internal threads in holes. They come in a variety of sizes, thread pitches, materials like high-speed steel and carbide, and coatings. Key features include the chamfered entering end for easy starting, and the tapered thread for easy insertion and alignment. They are available in plug, taper, and bottoming styles to suit different threading applications. Overall, these taps provide an efficient method for cutting internal threads to precise specifications.