Best Roundover Bit for CNC (2026): 5 Picks for Edge Profiling

Specs compared

Specifications are manufacturer rated, as published on each listing and collected 19 October 2026. “Not stated” means the listing does not give the figure.

What the listings tell you

We read five point-cutting roundover bit listings. Every one lists a 1/4 inch shank, and radii run from 3/16 inch to 1/2 inch. Four of the five list 2 flutes; the Amana lists 1. Stated materials center on wood in its forms, hardwood, softwood, plywood, particleboard, laminate and composites, with the Whiteside pair also listing hard plastics. Three listings contradict themselves between the title, bullets and spec table on diameter or length; each review below calls those out and follows the title and bullets.

One listing note worth reading twice: the Akylin set warns that the largest diameter bits should run at reduced speed, and that its bits are not a zero V point, so a small flat may remain along the centerline of the cut.

Buying guide: best roundover bit for cnc

Pick the radius for the look you want

A 3/16 inch radius gives a fine eased edge, 1/4 inch is the standard furniture edge, and 1/2 inch makes a bold round profile. The Akylin 4-piece set covers 3/16, 3/16, 1/4 and 1/2 inch radii in one kit, which is the economical way to try several looks before committing to single bits.

Match the shank to your collet

All five bits here list a 1/4 inch shank, so they fit a 1/4 inch collet on a CNC spindle, trim router or full-size router. If your spindle only takes a different shank, these five are not your bits; see our 1/4 vs 1/2 shank router bits guide.

Check the materials list

The Whiteside pair list natural woods, composite woods and hard plastics. The SpeTool lists wood, laminate, particleboard and plywood. The Akylin lists hardwood, softwood, plywood and composites. Buy the bit whose stated materials include what you actually cut; none of these five lists metal.

Mind the speed on large diameters

The Akylin listing says the largest bits should run at reduced speed. That is good practice for any large-diameter bit: a big cutter at full speed is a rough, hot cut. Start conservative on a scrap piece and watch the edge quality.

Project Match

• Signs and lettering: all five list signmaking, lettering or engraving among their uses.
• Cabinet doors and moldings: the Amana, both Whitesides and the SpeTool list decorative trimming, beading or fluting.
• 3D carving and relief work: the Akylin set lists 2D and 3D carving and relief carving.
• Fine detail edges: the Whiteside 1570 with its 3/16 inch radius is the smallest profile here.
• Trying several profiles cheaply: the Akylin 4-piece set covers four radii in one purchase.

How the scores add up

Each bit is scored on performance, build, value, safety and warranty, with the weights published on our How We Pick page. None of the five listings states a safety certification or a warranty term, so safety and warranty score zero across the set; the ranking comes down to stated cutting geometry, flute count, materials and set value.

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.

FAQ: lasers and CNC

What does a roundover bit do on a CNC?

It rounds over a sharp edge into a smooth radius, or cuts a decorative bead or groove into the surface. The point-cutting style here can plunge anywhere on the workpiece, so the profile does not have to start at an edge.

What radius roundover bit should I choose?

Choose by the look: 3/16 inch for a fine eased edge, 1/4 inch for a standard furniture edge, 1/2 inch for a bold profile. The five bits here span 3/16 to 1/2 inch, and the Akylin set includes all three sizes.

Do these bits work in a handheld router too?

The SpeTool and Akylin listings state use in CNC, table-mounted and handheld routers. The Whiteside listings describe router use generally, and the Amana describes woodworking use. With a 1/4 inch shank, all five fit a trim or full-size router collet.

What materials can these bits cut?

Per the listings: hardwoods, softwoods, plywood, particleboard, laminate, composites and, on the Whiteside pair, hard plastics. None of the five lists metal, so keep these bits to wood and wood-like materials.

What shank size are these bits?

All five list a 1/4 inch shank. Match it to a 1/4 inch collet; a loose or wrong-size collet is how bits walk and edges go wrong.

More laser and CNC guides

Related: our best CNC router bits for hardwood under 25, the best CNC bits for inlay work and end mill vs router bit. Also see the CNC tooling hub and handheld router vs CNC router.