Best CNC Bit Set for Engraving: 5 Picks for Signs and Detail Work

Specs compared

Specifications are manufacturer rated, as published on each listing and collected 20 October 2026.

What the listings tell you

We read five bit set listings. Piece counts run from 4 to 20. Two sets state a 1/8 in shank for rotary tools, two state a 1/4 in shank for CNC routers, and one listing states both 1/8 in and 5/32 in for the same shank. Three sets state carbide of some kind, one states high speed steel with a titanium coating, and one states solid carbide throughout. Three sets state a storage box or case. No listing states a warranty term, and no listing states a safety certification.

Buying guide: the best cnc bit set for engraving

Shank size: 1/8 or 1/4

The FOTYBEI and shengbenhao sets state a 1/8 in shank, which the listings say fits most small rotary tools. The Foos and SpeTool sets state a 1/4 in shank for CNC machines, hand routers and table routers. Check the collet on the machine before buying: a 1/4 in bit does not fit a 1/8 in collet, and an adapter is its own purchase.

Carbide, HSS and coatings

The FOTYBEI states tungsten carbide with a machining hardness of HRC70. The Foos and SpeTool state solid carbide. The shengbenhao states high speed steel coated with titanium. The HOZLY states carbide with a titanium coat. Carbide holds an edge longer in hard materials per the listings’ positioning; HSS sets like the shengbenhao trade some hardness for a lower piece cost across 20 shapes.

Bit profiles for engraving

Lettering and sign work live on V-groove bits: the Foos states 60 and 90 degree V-groove plus a 15 degree detail liner and a 20 degree profile bit, and the SpeTool states 60 and 90 degree V-groove bits too. The SpeTool adds tapered and ball nose bits for relief carving, plus up and down spiral bits for slots and mortises. The FOTYBEI states double-cut burr heads for material removal in wood, plastic and aluminum. The HOZLY states 0.5mm end mills for PCB and precision parts.

Length, diameter and flutes

The FOTYBEI states a total length of 45-50mm with a 1/4 in cutting diameter. The shengbenhao states a 3 mm cutting diameter on the 1/8 in (3mm) shank. The HOZLY states 0.5mm cutting diameter with 3 mm cutting length on a 1/8 in (3.175mm) shank, and warns to choose a cutting length that exceeds the board by 2-5mm or the end mill breaks. The SpeTool states a 1/4 in shank with 0.25 in cutting diameter and cutting lengths of 1/2, 1 and 1-1/8 inches. Flutes run 2 on the Foos, shengbenhao and HOZLY, 3 on the FOTYBEI, and 4 on the SpeTool, with the SpeTool stating center cut and the HOZLY stating non-center cutting.

Cases and storage

The FOTYBEI states its 10 burrs packaged in a small case for safe storage and protection. The shengbenhao states 20 pieces in a durable plastic box for carrying and storage. The SpeTool states 8 solid carbide bits packed in a plastic box. The Foos and HOZLY listings state no case in the shown text, so plan your own storage for those.

A note on PVC and ABS

The shengbenhao and SpeTool listings state PVC and ABS among the materials their bits cut. That is a CNC routing statement, not a laser statement. Never laser PVC, vinyl, PVC faux leather, polycarbonate or ABS: the fumes are hazardous. These are mechanical bits, so the warning applies only if the same materials go near a laser.

Project Match

• Sign lettering and V-carving: the Foos 4Pc V-Groove Set states 60 and 90 degree V-groove bits, a detail liner and a profile bit for exactly this work.
• Relief carving and slots on a CNC router: the SpeTool 8Pc Carbide Set states tapered, ball nose, spiral and V-groove bits with a 1/4 in shank.
• Small rotary-tool detail work: the FOTYBEI 10Pc Burr Set states a 1/8 in shank with double-cut heads for wood, plastic and aluminum.
• Many shapes for crafts and models: the shengbenhao 20Pc HSS Set states 20 shapes for woodworking, carving, drilling and engraving.
• PCB and precision parts: the HOZLY 10Pc 0.5mm End Mill states 0.5mm cutting diameter bits for printed circuit boards.

How the scores add up

Each set is scored on performance, build, value, safety and warranty, with the weights published on our How We Pick page. A spec the listing does not publish scores nothing.

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 shank size do I need?

It depends on the machine. The FOTYBEI and shengbenhao state a 1/8 in shank for small rotary tools, while the Foos and SpeTool state a 1/4 in shank for CNC machines and routers. Match the stated shank to the collet.

Carbide or HSS?

The FOTYBEI states tungsten carbide with HRC70 hardness, and the Foos and SpeTool state solid carbide. The shengbenhao states high speed steel with a titanium coating. Carbide is the harder stated material here; the HSS set offers the most shapes at 20 pieces.

What is wrong with the HOZLY listing?

It contradicts itself twice. The title states a 1/8 in shank while the spec table states a 5/32 in shank diameter, and the title states a 0.5mm cutting diameter while the spec table states a 1/8 in cutting diameter. We trust the title and bullets, so the comparison uses 1/8 in and 0.5mm, with the inconsistency docked in the score.

Can I use these bits in a Dremel-style rotary tool?

The FOTYBEI and shengbenhao listings state their 1/8 in shank bits fit most small rotary tools. The Foos and SpeTool listings state 1/4 in shanks for CNC machines, hand routers and table routers instead.

What do V-groove bits do?

V-groove bits cut V-shaped lines for lettering, sign borders and detail inlay. The Foos set states 60 and 90 degree V-groove bits plus a 15 degree detail liner for fine lines, and the SpeTool set states 60 and 90 degree V-groove bits as well.

More laser and CNC guides

Related: end mill vs drill bit for CNC, chamfer mill vs V bit and end mill vs router bit. Also see our solid carbide vs carbide tipped router bits and our MDF vs plywood for CNC router.