Norseman 57580 SP-18TD 20-UB Spiral Pt Plug Magnum Super Premium Tap/Drill Set Committed to Quality, Consistency, Service and Value QUALITY at Viking Drill and Tool begins with the finest tool steel we can buy and ends with the world class products in our catalog. Our cutting tools are designed, engineered and superbly crafted to provide long lasting durability. Our 74,000 square foot St. Paul, Minnesota manufacturing facility is specifically designed for the unique task of efficient high quality cutting tool manufacturing. CONSISTENCY is a natural by-product of our experience and dedication to quality. At Viking Drill and Tool, skilled machine operators working with the world's finest raw materials have the capability of providing you with consistent high quality products time after time, year after year. On our Ultra Bor Super Premium products, we routinely cut recognized tool tolerance standards by one half to insure that our customers receive drills manufactured to the tightest possible specification and utmost in consistency and accuracy. All materials used at Viking Drill and Tool meet the rigorous qualifications of National Aerospace Standard (NAS) 907. This standard, recognized as the most stringent in the industry precludes the use of lower quality steels which do not hold up under rigorous applications. The use of these extreme high quality materials insures that consistency is built in to every one of our U.S. manufactured products. Our extensive selection of U.S. manufactured tools is designed to give you the right tool at the right price for whatever tough job you come up against.SP-18TD Spiral Point, NC1 setDrill - 240-UB: #'s 36, 29, 25, 21, 7, F, 5/16, U, 27/64Tap - 20-UB: 6-32, 8-32, 10-24, 10-32, 1/4-20, 7 5/16-18, 3/8-16, 7/16-14, 1/2-13