Best Engraving Bit for Plastic Under $15 (2026)

Specs compared

Specifications are manufacturer rated, as published on each listing and collected 27 October 2026.

What the engraving bit listings tell you

The Dremel listing states a ball bit with a working diameter, a shank size and a material in the bullets, with a spec table that mostly matches the bullets. The bullets name shaping, carving, engraving, hollowing, grooving, slotting, inlaying, making tapered holes and freehand routing, and name wood, fiberglass, plastic and soft metals as materials. The SPTA listing names engraving bits and router bits for rotary tools, with a shank size and a set grouping in the title, and names woodworking, carving, engraving and drilling as work types. Reading the two listings side by side shows a clear split: the Dremel listing gives a shape, a working diameter and a material for a single bit, while the SPTA listing gives a set grouping and a shank size for a group of bits. A reader who wants a stated working diameter and a stated ball shape has that detail from Dremel, while a reader who wants a set of bits for rotary tool work has the SPTA grouping to weigh. Neither listing states a warranty term, and neither listing states care instructions, so those points stay blank for the picks and do not separate them. The WayinTop listing names a carbide drill bit set for CNC engraving, so it sits apart from the rotary engraving picks and is scored lowest here. The comparison rests on what each listing states about shape, shank, material and work type, and on nothing else.

Buying guide: best engraving bit for plastic under 15

Shank and fit

Shank size decides whether a bit fits the tool at all. Dremel states a 1/8 inch shank for rotary tools that accept a 1/8 inch shank, and states a working diameter of 3/32 inch alongside that shank size. SPTA states a 1/8 inch shank in the title, with 3mm given alongside the shank size in the title. A rotary tool that accepts a 1/8 inch shank is the fit line for both picks, and a tool with a different collet size would need a different bit. Check the shank line before ordering, because a bit that does not fit the collet cannot be used for any cut, however well its shape suits the job. For the SPTA pick, the shank line sits in the title, so read the title closely and match it to the tool. WayinTop states no shank size in its title, so shank fit is Not stated for that set.

Bit shape and cut

Shape decides the cut a bit can make. Dremel states a ball shape for concave cuts and round bottom slots and grooves, with a working diameter of 3/32 inch. That ball shape suits rounded side cuts and hollowed areas, and the round bottom slot shape follows from the ball form. A maker who wants a concave cut, a hollowed area or a round bottom groove has a stated shape for that work from Dremel. SPTA states no shape beyond engraving bits and router bits in the title, so a maker who wants a stated ball shape or a stated round bottom slot shape will not find that shape wording in the SPTA title. WayinTop states a spiral flute in its title. For a closer look at bit shapes, see our V bit vs engraving bit guide. Shape also sets the width of the cut: Dremel states a working diameter of 3/32 inch, so the cut width follows that stated diameter, while the SPTA title states a shank size and a set grouping without naming a working diameter. Choose shape first for grooves and concave work.

Plastic types and the laser warning

Plastic work needs a clear material line. Dremel states plastic among wood, fiberglass, plastic and soft metals for rotary tool use, so plastic sits alongside wood and soft metals in that listing. SPTA names woodworking, carving, engraving and drilling in the title, without naming plastic in the title, so the plastic line for that pick rests on engraving and drilling work in general rather than on a stated plastic line. Do not laser PVC or ABS: these listings describe rotary tool bits for mechanical cutting, not laser bits, and lasering those materials is not suggested here. For more plastic options, see our best engraving bit for plastic guide. If a job involves plastic sheet, a plaque blank or a small plastic part, the Dremel listing gives a direct plastic line, while the SPTA listing gives a general engraving line that a reader must weigh with care.

Materials and work types

Material wording tells a reader what the bit is made to cut and what it is made from. Dremel states high speed steel as the material, with wood, fiberglass, plastic and soft metals as work materials, and the spec table states Metal as the material type. SPTA states HSS and carbide wording in the title, with woodworking, carving, engraving and drilling as work types. High speed steel and HSS wording point to a steel bit family, while carbide wording points to a harder bit family, and the two listings use different wording for that reason. Work types matter as much as material: Dremel names shaping, carving, engraving, hollowing, grooving, slotting, inlaying, making tapered holes and freehand routing, so a reader can match a job to a named work type. SPTA names woodworking, carving, engraving and drilling, so a reader can match a job to those named work types. A sign job, a plaque job and a small part job all sit inside engraving and carving work, while a hole job sits inside drilling work and a slot job sits inside grooving and slotting work.

Reading a listing before ordering

Read a listing in order: title, bullets, spec table, and then the set grouping. For Dremel, the title names an engraving bit for wood, plastic, linoleum and soft metal, the bullets name the ball shape, the working diameter, the shank size and the material, and the spec table repeats the shank and size detail with some differences to note. The spec table states a diameter of 0.13 inches, which matches the shank rather than the working diameter, and states Size Name 2-Piece with Unit Count 2 Count while Number of Items states 1, so the pack count differs within the spec table. Trust the title and bullets over the spec table where they differ, and note the difference rather than smoothing it away. For SPTA, the title names a set grouping, a shank size and work types, so read the title closely for the grouping and the shank line. A listing that states a warranty term would earn warranty points, and a listing that states a safety feature would earn safety points, but neither pick states either, so both stay at zero on those two criteria. Order only after the shank, the shape, the material and the work type all match the job.

Project Match

• Plastic signs and plaques: Dremel 107, with plastic stated in the bullets, and SPTA Engraving Bits, with engraving work named in the title.
• Detailed grooves and concave cuts: Dremel 107, with a ball shape stated for concave cuts and round bottom slots.
• Rotary tool engraving sets: SPTA Engraving Bits, with engraving bits for rotary tools named in the title and a 1/8 inch shank stated.
• Woodworking, carving and drilling: SPTA Engraving Bits, with woodworking, carving, engraving and drilling named in the title, and Dremel 107, with carving and engraving named in the bullets.
• CNC engraving drill work: WayinTop Drill Bits, with carbide drill bits and CNC engraving named in the title, scored lowest here as a drill bit set.

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. For bits, safety points come from stated safety features, and no listing here states a laser safety feature, a guard or a rated shield, so no pick earns safety points. No listing states a warranty term, so no pick earns warranty points. Performance points follow the stated shape, working size and material use, build points follow the stated material and shank detail, and value points follow how clearly the listing states what the bit is for.

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

Can these bits engrave plastic?

Dremel states plastic for rotary tool engraving, with wood, fiberglass, plastic and soft metals named in the bullets. SPTA names engraving work in the title without naming plastic in the title, so the plastic line is direct for Dremel and general for SPTA. Do not laser PVC or ABS with these listings, since they describe mechanical bits, not laser bits.

What shank size do these bits use?

Dremel and SPTA state a 1/8 inch shank. Dremel states the shank for rotary tools that accept a 1/8 inch shank, and SPTA states a 1/8 inch shank in the title, with 3mm given alongside it.

Which bit suits detailed grooves?

Dremel 107 suits detailed grooves, with a ball shape stated for concave cuts and round bottom slots and grooves, and a working diameter of 3/32 inch stated.

Do any of these bits state a warranty term?

No. No listing in this group states a warranty term, so no pick earns warranty points.

What work does the SPTA set name?

The SPTA title names woodworking, carving, engraving and drilling, with engraving bits and router bits for rotary tools, a 1/8 inch shank, and 10Pc and 10Pcs groups.

Is the WayinTop set a rotary engraving bit?

No. The WayinTop title names a carbide drill bit set for print circuit board, stone, jewelry and CNC engraving, so it is a drill bit set, not a rotary tool engraving bit for plastic, and it is scored lowest here.

More laser and CNC guides

See every CNC tooling guide and all laser accessories guides. Also see our best engraving bit for plastic. Also see our best engraving bits for wood under 15.