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Drill America DWTET Series Qualtech extension tap is used for tapping the hubs of pulleys for oil caps or set screws. High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Uncoated tools feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications. Small round with square end shank. Right-Hand cut tools have a cutting action that engages when they are run in a clockwise direction.