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Solid Carbide Spiral Flush Trim 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. These Flush Spiral are fitted with a bearing (or two) on the bottom of the bit. The bearing rides the edge of the worksurface creating a smooth flush cut.
Up cut Spirals direct chips up towards the router.
Down cut Spirals direct chips downward exerting a downforce on the workpiece for better hold down in fixtures.