Slow Spiral (Low Helix) Router Bits are designed to lessen the up or down force to help keep chip outs from happening on the top of the material. Great for more brittle substrates.

A downcut bit is the perfect choice for cuts where having a clean top surface. The down cut action of the bit cuts from the surface down ensuring that you have a perfectly clean top edge reducing any fraying or chipout that would be left if you were using an upcut bit for the same cut.