1CNC manufacturing, with uniform specifications, fine lines, high speed and stability. 2The knife teeth are precise and accurate, so small that they are hard to see with the eyes. 3Precision machine tool grinding edge, wearresistant, good cutting and high efficiency. 4The knife body is straight, concentric, so there is no problem of knife jumping or jitter. 5Made of high quality tungsten steel, making the needles very firm.