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Solid Carbide Up Down Compression Spiral Bits
Spiral bits, by their design, cut smoother and create less load on the router than standard one, two and three flute bits. The spiral bits shear through the work rather than "slapping" through it. They are generally more expensive but in most cases provide for a better finished product.
Up/Down Compression Spirals are specially designed to prevent tear-out on double faced laminates by directing the chip load towards the center of the substrate.