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Solid Carbide Spiral Shear Face
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 cut Spiral sare best for grooving or slotting. Directs chips up towards the router.
Down cut Spirals are best for routing all the way through material when best finish is to be on the top side of the workpiece. Directs chips downward exerting a downforce on the workpiece for better hold down in fixtures.