M16 X 2 Metric Left Hand Screw Thread Milling Straight Flute Tap And Round Compatibility: M16 x 2 metric tap and die set are suitable for making or repairing male and female threads. They are both left hand thread, durable, and with clear threads, good for general purpose applications. Wide Applications: Used to process through holes in maintenance and repair work. For tapping alloy steel , die steel, cast iron, ferrous and non-ferrous materials etc.. Use with tapping oil to get higher quality threads and more durable taps and dies. Features: Straight flute design, downward chip removal. High speed steel tap has high hardness, good toughness, wear resistance. The round die features good abrasion resistance. Features just the base substrate without any coatings. Easy to Use: Round dies can be used with die wrench (not included). The fastening screws in the middle of the wrench should be inserted into the slot of the die and tightened. Machine taps are used on drill presses, tapping machines, CNC and milling machines. It suggested to be used with tap collets with overload protection. Tips: Recommended feed rate: general steel: 6-15m/min; harder steel: 5-10m/min; stainless steel: 2-7m/min; cast iron: 8-10m/min. The torque caused by too fast feed speed is too large, which can easily cause the tap to break.