Material types: high carbon steel for hand tapping applications and high speed steel for machine tapping where critical dimensions are required . Etched: tap size and recommended drill bit size are etched on each tool for easy identification. Point styles: taper, plug, and bottoming styles are available . All Hanson taps and dies are made in USA . Steel Machine Screw Tap Specs: Precision ground straight flutes provide rapid chip removal for efficient threading . Designed for hand threading work . Taps produce a class 2B thread . 1 to 1-1/2 threads chamfered . Used when threads must go to bottom of hole . Ideal for all general-purpose threading . Ideal for tough threading work, routine maintenance, repair and for re-threading where high accuracy and tolerance thread is not critical