🔍 Spiral flush trim bits have cutting flutes that spiral around the bit, which shears the wood fibers more like a plane, rather than chopping like a straight bit. This shearing action yields a much **smoother cut with less tear-out** – especially on tricky grain. In fact, a solid carbide spiral flush trim will leave extremely smooth finished surfaces where straight bits might splinter:contentReference[oaicite:49]{index=49}. Also, the spiral helps pull the chips out and reduce burning. Essentially, a spiral flush trim bit combines the clean cut of a spiral end mill with the guidance of a bearing. They excel in woods that tend to tear (like oak or plywood veneers). Straight bits are okay for some tasks, but if you have a lot of pattern cutting or are working with expensive material, the spiral type will give superior results and often stay sharp longer as well.

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