This National Twist Drill is a top-quality product made in the United States. It features a tap thread size of 1-1/8 inches and is designed for use in metalworking. The brand is well-known and respected in the industry, and this product is sure to meet your needs. It is a must-have for anyone in the business of metalworking and is classified under the categories of Business & Industrial, CNC, Metalworking & Manufacturing, and Metalworking Supplies.