Material HSS Finish Type Currency Tool Spline Type Spiral Recommended Surface Plastic, Wood About this item ApplicableDrilling and tapping of plastic, wood and soft metals such as aluminum and iron. These taps are made of high speed steel for high hardness and rust resistance. Self-centering designNo need to drill or drill holes in the center. It can greatly reduce processing steps, save time and improve work efficiency. MetricM3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1. 5. Handle: 1/4" (6.35mm) hex shank. You can use to take advantage of various threads. Suggestion It is recommended to be used on a tapping machine. Be careful when using a hand drill.The tap adopts a spiral groove design, and the chip removal process is better. [Material] HSS (4341) has high hardness, anti-rust and durable.