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Impact rated, and it names its own thickness limit

Milwaukee 48-89-4874, Shockwave drill-tap, 5-piece

The only drill-tap set on this shelf built to survive an impact driver, and one of two that publish the metal thickness they will tap.

Milwaukee Shockwave drill and tap bits in five SAE sizes

Milwaukee 48-89-4874, Shockwave drill-tap, 5-piece

The only drill-tap set on this shelf built to survive an impact driver, and one of two that publish the metal thickness they will tap.

Amazon reference
B08MFS1ZKM
EAN
0045242860401
  • Rated for impact drivers as well as drills, which no other set on this shelf claims
  • Publishes a thickness limit — metal up to 1/4 in — the most generous stated figure here
  • Five sizes, the smallest range on this shelf, and no metric at all

Best for: Tapping on site with the impact driver already in your hand

≈ $32
Check price on Amazon

Specifications

Amazon reference
B08MFS1ZKM
EAN
0045242860401

Two numbers make this the trade choice on this shelf. The first is a thickness: metal up to 1/4 in, which is 6.35 mm (0.25 in) and the most generous figure any listing here publishes. The second is not a number at all but a rating — Shockwave Impact Duty, meaning the bits are engineered to survive an impact driver.

That second point is the one that matters on site. An impact driver delivers torque in hammer blows, and a tap is a brittle tool loaded in torsion: an ordinary drill-tap in an impact driver snaps, usually inside the hole. No other set on this shelf claims impact duty, so no other set on this shelf should go in one.

The range is the narrowest here — five sizes, 8-32 UNC, 10-24 UNC, 10-32 UNF, 12-24 UNC and 1/4-20 UNC — and all imperial. Within that it is well chosen: both #10 pitches are present, coarse and fine, which three of the cheaper sets omit. What is missing is a quick-change adaptor, supplied with three kits here, and any statement of a coating or surface treatment. The phrase “SAE steel construction” names a standards body rather than a grade of steel.

Availability

Read on the day this page was built: $32 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

Why does impact rating matter on a tap?

Because an impact driver hammers as it turns, and a tap is a brittle tool loaded in torsion. A standard drill-tap in an impact driver will snap — the hammer blows arrive as torque spikes far above anything a drill produces. Milwaukee’s Shockwave line is engineered for that duty, and this is the only set on this shelf to claim it. If what you have in your hand on site is an impact driver, it is the only one here you should put in it.

A quarter inch of metal — is that realistic?

It is the most generous figure on this shelf, and it is published rather than implied. The Greenlee kit states 10 gauge, about 3.4 mm (0.13 in); a quarter inch is 6.35 mm (0.25 in). Whether a given bit reaches it depends on the thread — the tap section on a 1/4-20 bit is longer than on an 8-32 — and on keeping the tool cool and square. What matters is that the limit exists on the page at all, where at least five of the eleven listings here publish nothing.

More drill bits & taps

  • NEIKO 13-piece combination drill and tap set in its case

    NEIKO 10059A, 13-piece drill-tap set

    The only combination set on this shelf that covers both thread systems and whose stated piece count matches its own contents.

    Amazon reference
    B0762HJ3GF
    EAN
    0816914021129
    • Covers both systems — six SAE sizes and six metric — in one case
    • The arithmetic is right: six plus six plus one adapter is thirteen
    • No coating or surface treatment stated, where the sets at half the price claim titanium or nitriding

    Best for: A workshop that meets both imperial and metric threads and does not want two sets

    ≈ $30
    Check price on Amazon
  • 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
  • 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

Elsewhere in the workroom

  • HOPSON TOOLS 16 mm carbide turning tool set, 10 pieces, product photograph

    HOPSON TOOLS 16 mm carbide turning tool set, 10 pieces

    Sixteen-millimeter shanks for a heavier lathe: five holders, five inserts, and rigidity where it counts.

    Shank
    16 mm (0.63 in)
    Contents
    5 holders and 5 indexable inserts
    Type
    Carbide indexable
    Amazon reference
    B0FCS779YW
    EAN
    0725650977556
    • 16 mm (0.63 in) shanks are far stiffer than 10 or 12 mm (0.47 in) — less chatter under load
    • Live on all six markets under one reference
    • €95, and only five inserts to start with

    Best for: Larger bench lathes with a 16 mm (0.63 in) tool post, cutting steel at depth

    Check price on Amazon
  • Hyundai Welding MB25 set, 0.8 / 1.0 / 1.2 mm, product photograph

    Hyundai Welding MB25 set, 0.8 / 1.0 / 1.2 mm

    Three tip sizes in one box — the set to buy when you do not yet know which wire you will settle on.

    Torch
    MB25 / type 250
    Thread
    M6
    Tip sizes
    0.8, 1.0 and 1.2 mm (0.05 in)
    Contents
    Contact tips, gas nozzle, tip holder
    Amazon reference
    B0C3H3GQG1
    EAN
    0725844867205
    • Covers every wire diameter a 200 A machine is likely to run
    • One order instead of three when you change wire
    • You will use one size far more than the other two

    Best for: A new MIG owner who has not yet settled on a wire diameter

    Check price on Amazon
  • 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

    Check price on Amazon

All drill bits & taps