Spiral-flute bits combine a shearing action in cutting with an augering action in chip clearance. The shearing action yields an especially clean accurate cut while the augering action clears chips from the cut. The ‘Up-Cut’ shears from the bottom up pulling chips from the bottom up thus allowing deeper penetration with less stress on the tool. An excellent choice for mortising.

Straight Flute Router Bits offer a neutral cutting action, which creates higher cutting forces than a spiral flutes. General usages tools

Straight Flute Plunge Router Bits offer a lot of versatility by allowing you to start a cut in the middle of a work piece.