The HERTEL HSS Hand TAP 5/16-18 H3 4fl 02385011 is a high-quality spiral point tap designed for efficient cutting and tapping of steel, aluminum, and other metals. With a tap thread size of 5/16 inches - 18, this product is perfect for various machining and manufacturing applications. The HERTEL brand is known for producing reliable and durable tools, making this hand tap a valuable addition to any workshop or production floor.