【Good Quality Material】High-speed steel 6542,tool is great for general purpose applications, offering high hardness and toughness. Titanium coating for improving wear and fusion resistance, long service life .
Square Head Size:3.1x 3.1mm/4.0x 4.0mm/4.1x4.1 mm/4.6x4.6 mm/5.1x5.1 mm (L*W).
【Usage】Suitable for drill presses, tapping machines, CNC and milling machines. Used with tapping oil to get higher quality threads and more durable taps .
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