Uxcell 5 Pairs Metric Hand Threading Tap Set M2.5 Thread 0.45Mm Pitch Taper Metric Taps: M2.5 x 0.45 metric taps set. Taper style: starts the thread square with the workpiece. Plug style: generally used in through holes. Applications: The hand threading tap kit is used to re-thread damaged or jammed threads. Suitable for threading mild steels, aluminum, iron, copper, hard plastic. Easy to Use: Hand tapping, mainly used with tap wrenches. Standard thread milling taps are used to thread through holes or shallow and blind holes. Features: Straight flute design, downward chip removal. High speed steel tool is high hardness, high strength, good toughness, and wear resistance. Tips: Add appropriate tapping oil for higher quality internal threads and more durable taps. Without any additional coatings, good for general purpose applications.