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Six bits, all the same size

QWORK DG39142, 1/4-20 drill-tap, 6-pack

Six combination drill-tap bits in a single thread size — which is not what "6 pcs" means on the two sets beside it on this shelf.

QWORK titanium-coated combination drill and tap bits in their case

QWORK DG39142, 1/4-20 drill-tap, 6-pack

Six combination drill-tap bits in a single thread size — which is not what "6 pcs" means on the two sets beside it on this shelf.

Amazon reference
B0GKC9KXWC
EAN
0795973764096
  • Six bits of one size, so a snapped bit is replaced immediately rather than ordered
  • Titanium coating on HSS, stated for thermal stability
  • All six bits are 1/4"-20 — this is not a size set, and the title does not make that obvious

Best for: One thread size used constantly, where the bit that snaps is replaced from the same box

≈ $7
Check price on Amazon

Specifications

Amazon reference
B0GKC9KXWC
EAN
0795973764096

This hub’s buying tip is that heat kills bits rather than hardness, and nothing on this site proves it faster than a combination drill-tap. It drills the hole, cuts the thread and countersinks the mouth in one pass, which is genuinely quicker — and it does all three with a slender tool that snaps when it gets hot or when the drill is not square to the work.

Which is why six of them is the right purchase, and why this listing is worth understanding properly. All six bits here are 1/4 in-20 UNC. That is not the usual meaning of a six-piece drill-tap set: the two sets beside it on this shelf contain six different thread sizes for twice the money. If 1/4-20 is the thread you use — and on general fabrication it often is — six spares is better value than six sizes you will mostly leave in the case.

The construction is ordinary and correctly described: HSS with a titanium coating for thermal stability, a 1/4 in hex quick-change shank, a tapered end to reduce hammering, a back taper that extends past the tap so over-drilling cannot chew the thread, and laser-engraved sizes. The materials named are honest — aluminum, thin steel, timber — and the final instruction is the important one: use it at low speed.

Availability

Read on the day this page was built: $7 at the American Amazon shop.

Read from Keepa on the day this page was last revised; stock and price both move without notice.

Prices quoted in this text were read on 2026-10-07. The live price is at the top of the page.

The questions welders ask

Is this a set of sizes?

No, and it is the thing to notice before ordering. All six bits are 1/4 in-20 UNC. The two six-piece sets alongside it on this shelf, at twice the price, contain six different thread sizes from 6-32 up to 1/4-20. Six of one size is genuinely useful if that is the thread you use — these bits snap, and a spare in the box beats a week waiting — but "6 pcs" means something different on each of the three listings.

Why does the listing tell me to go slowly?

Because heat is what destroys these bits, which is exactly what this hub’s buying tip says: heat kills bits, not hardness. A combination drill-tap is a long, slender tool doing two jobs at once, and at drill speed the tap section overheats, work-hardens the hole and snaps off inside it. The listing recommends low speed "for best results", which understates it — low speed and cutting fluid are the difference between a bit that lasts and a bit that is now part of your workpiece.

More drill bits & taps

  • Greenlee DTAPKIT one-step drill and tap kit with its quick change adaptor

    TEMPO Greenlee DTAPKIT

    A trade kit that publishes the one limit these bits actually have — the thickness of metal it will tap through, up to 10 gauge.

    Amazon reference
    B0041FIR1E
    EAN
    0013161051743
    • Publishes a material thickness limit — up to 10-gauge metal — which only one other listing here does
    • Names the materials properly: aluminum, brass, copper, plastic and mild steel
    • Ten gauge is about 3.4 mm (0.13 in) — thicker section needs a tap and a tapping drill, not a combination bit

    Best for: Electrical and plumbing work on enclosures, strut and panel up to 10 gauge

    ≈ $31
    Check price on Amazon
  • Baer Thread cutting set M3–M12, HSS-G, product photograph

    Baer Thread cutting set M3–M12, HSS-G

    Taps and dies from M3 to M12, in ground HSS — the sizes that cover almost every workshop repair.

    Range
    M3 to M12
    Material
    HSS-G (ground high-speed steel)
    Covers
    Internal threads (taps) and external threads (dies)
    Amazon reference
    B09Z25RGQH
    EAN
    4058462189814
    • HSS-G means ground rather than rolled flutes: sharper and more accurate
    • M3–M12 covers the vast majority of workshop fasteners
    • Not sold on the American store at the time of checking

    Best for: Repairing stripped threads and making threaded holes properly

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  • Baer Thread cutting set M3–M12, 30 pieces, product photograph

    Baer Thread cutting set M3–M12, 30 pieces

    The same range with the matching drills in the box — no chart, no arithmetic, no broken taps.

    Range
    M3 to M12
    Quantity
    30 pieces
    Material
    HSS-G
    Includes
    Taps, dies and matching tapping drills
    Amazon reference
    B08KGJL6YT
    EAN
    4058462016844
    • The tapping drills are in the box, matched to each thread
    • Removes the commonest cause of broken taps: an undersized hole
    • €138 — twice the set without drills

    Best for: Someone who taps rarely enough to forget the drill sizes each time

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Elsewhere in the workroom

  • IPOTOOLS Argon/CO₂ regulator, product photograph

    IPOTOOLS Argon/CO₂ regulator

    The cheapest way to get gas from a bottle to a torch, from an importer with an address.

    Gases
    Argon and CO₂
    Use
    MIG/MAG and TIG shielding gas
    Amazon reference
    B00KPQ51IA
    EAN
    0683405444107
    • €33 for the part that stands between a 200 bar bottle and your torch
    • IPOTOOLS publishes a company address, unlike most sellers in this category
    • No flow range or gauge specification published

    Best for: A first bottle setup on a MIG or TIG machine

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  • Kemper Smart Master with 3 m arm, product photograph

    Kemper Smart Master with 3 m arm

    The professional answer, at professional money — a 3 m (10 ft) arm and a maker that does nothing else.

    Format
    Mobile extraction unit
    Arm
    3 m (10 ft) reach
    Manufacturer
    Kemper — welding fume extraction specialist
    Amazon reference
    B07QS2SQKY
    EAN
    0758198392741
    • A 3 m (10 ft) arm reaches the whole of a normal welding bay from one position
    • Kemper builds extraction and nothing else
    • €2,025 — more than every welding machine on this site combined at the entry end

    Best for: A business welding daily, where exposure is an occupational health obligation

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  • IPOTOOLS LY800H, product photograph

    IPOTOOLS LY800H

    A published viewing area — 100 × 93 mm (3.94 × 3.66 in) — which is the one helmet figure you can actually compare.

    Type
    Auto-darkening, True Color
    Viewing area
    100 × 93 mm (3.94 × 3.66 in)
    Amazon reference
    B07V42K7NH
    EAN
    4251395106914
    • A published viewing area, which no other European helmet listing here gives
    • A large window means less head movement to follow a long seam
    • Switching time and optical class still not published

    Best for: Long seams and awkward positions, where a small window forces you to move your head

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All drill bits & taps