Open a Router Bit Set for the first time and it's not always obvious what each bit is for. The shapes look similar at a glance, but each one is built for a distinct job, and knowing the difference saves a lot of trial and error.

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Straight Bits

These are the workhorses of most sets — a straight cutting edge used for grooves, dados, and mortises. If a project calls for a clean, flat-bottomed channel cut into wood, a straight bit is almost always the tool for it.

Flush Trim Bits

Flush trim bits follow a template or existing edge, cutting material flush to that reference surface. They're essential for template work and for trimming laminate or veneer so it sits perfectly level with the material beneath it.

Round Over Bits

As the name suggests, these soften a sharp 90-degree edge into a smooth curve. They're a common finishing touch on tabletops, shelf edges, and anywhere a project benefits from a more comfortable, less angular feel.

Chamfer Bits

Chamfer bits cut a flat angled edge rather than a curve, giving a more geometric, beveled look. They show up often in furniture design where a crisp angled line is preferred over a rounded profile.

Cove Bits

Cove bits cut a concave curve into an edge — essentially the inverse of a round over. They're frequently used for decorative molding and trim work where a scooped profile adds visual interest.

Rabbeting Bits

These cut a step-shaped recess along an edge, commonly used for joinery — fitting a cabinet back panel into a frame, or creating a lip for glass or a picture frame insert.

Most Woodworking Router Bit Sets combine several of these profiles into one package, which is worth keeping in mind when comparing options in a router bit set lineup built for general shop use.

FAQ

Which bit type gets used most often in furniture building? Straight bits and round-over bits tend to see the most use across a typical furniture project.

Do cove and round-over bits serve the same purpose? No — round-over softens an edge into a convex curve, while cove creates a concave, scooped profile with a different visual effect.

Is a rabbeting bit necessary for a beginner set? It's useful for joinery-heavy projects but not essential for purely decorative or trim-focused early work.