Excellent at loosening, and never the tool that finishes the job · review
The only tool here publishing a torque and an rpm for every stage, and the heaviest at 10 lb.
The last word Its three stages are fully specified, which nothing else here manages. Then read the 10 lb and the 16-inch body against what this tool is held up to do.
A 1/2-inch square-drive brushless cordless wrench at 21 V, stating 900 ft-lb / 1200 N·m maximum torque and 3800 rpm, with three stages published as 1800 rpm / 500 N·m, 2800 / 800 and 3800 / 1200; a tungsten steel anvil, an alloy steel hammer head, a double-layer ABS housing, a cooling fan, a smart auto-stop, a 10-second auto-shutoff, a reverse brake stop, and protection against over-current, over-voltage, overheating and short circuits. Two 4000 mAh batteries, a charger to 70% in 30 minutes, five impact sockets (17, 19, 21, 22, 24 mm (0.94 in)), an extension rod and an ABS case. A 16-inch body at 10 lb. $99.99.
“Speed 1: 1,800 RPM / 500 N·m, suitable for precision work; Speed 2: 2,800 RPM / 800 N·m, suitable for standard bolts; Speed 3: 3,800 RPM / 1,200 N·m, suitable for hard-to-tighten nuts.”
A torque and a speed for each of three settings. On this shelf that is unique:
| Tool | Stages | Torque per stage | Rpm per stage |
|---|---|---|---|
| This tool | 3 | 500 / 800 / 1200 N·m | 1800 / 2800 / 3800 |
| DCA ADPB520 | 4 | 350 / 420 / 520 + 682 | — |
| Dong Cheng, published | 3 | 431 and 507 among them | — |
| Robustrue | 3 | — | 2000 / 2200 / 2800 |
| DEWALT | 4 | — | — |
The published Dong Cheng page states the principle: publishing the torque of the stages “is what makes a selector usable”. This publishes both halves, so a buyer can see that stage 2 at 800 N·m matches the entire output of the Robustrue tool on this shelf.
“The compact 16-inch body weighs just 10 lbs and features a TPE non-slip grip… even beginners can enjoy effortless, fatigue-free one-handed operation during extended use.”
The introduction puts weight third among its criteria, and gives the reason: “this is held at arm’s length under a wing.”
| Tool | Stated weight | Stated length |
|---|---|---|
| Robustrue | 3.74 lb (1.70 kg) | 5.9 in |
| DCA ADPB520 | 4.4 lb (2.0 kg) | 6 in |
| Dong Cheng, published | 2.2 kg (4.9 lb) | — |
| This tool | 10 lb (4.5 kg) | 16 in |
Ten pounds is 4.5 kg, which is 2.6 times the Robustrue figure, and 16 inches is nearly three times its length. Those two numbers are published in the same sentence as the words “compact” and “effortless, fatigue-free one-handed operation”, and the sentence does not survive them. Held at arm’s length over a wheel arch, 4.5 kg at 400 mm is a different tool from 1.7 kg at 150 mm.
It is the right size for what the bullets also describe — “construction sites, machinery, or scaffolding”, standing on the ground with the work in front of you. It is the wrong size for a subframe bolt above your head.
“The smart auto-stop function eliminates the risk of over-tightening damage.” And: “can install car and truck wheel bolts in just 3 seconds.”
The rule at the top of this shelf: “an impact gun loosens wheel bolts, and a torque wrench finishes them.”
An auto-stop is a cut-out: it stops the motor when resistance reaches a threshold the tool decides. That is not a calibrated torque, there is no figure published for it on any of the three stages beyond the stage maximum, and it is not adjustable to a vehicle’s specification. “Eliminates the risk” is a stronger word than the mechanism supports.
Compare how the DEWALT tool on this shelf words the same function: “designed to help prevent overtightening and fastener run-off” — a hedge, and an honest one. And the published Bosch wrench offers “automatic slow-down”, which is a description of behavior rather than a guarantee.
Three seconds to install a wheel bolt is also true and beside the point. The bolt still has to be checked with a torque wrench afterwards, and this site has a torque wrenches shelf for that.
“It is 90% more efficient than a manual wrench while reducing physical exertion by 80%.” And: “two 4000mAh battery packs (providing 200% longer runtime).” And: the charger reaches “70% capacity in just 30 minutes”.
The last is a specification: a stated charge level at a stated time, which can be checked against a clock. The other three are not — no method, no comparison tool, no baseline. “200% longer runtime” is measured against an unnamed battery, presumably a 2.0 Ah pack, which the Robustrue listing on this shelf states explicitly (“in contrast to 2.0 Ah batteries, the runtime is increased by 50%”).
None of that makes the tool worse. It means the numbers to compare on are the ones above: 1,200 N·m, three specified stages, 4.5 kg (9.9 lb), 16 inches.
“5 heavy-duty, wear-resistant sockets (17/19/21/22/24mm) to handle 95% of automotive and industrial bolts” — and the contents list calls them “5x Impact Wrench Sockets”.
The buying advice for this shelf: “use impact sockets, not chrome ones. Chrome sockets are hardened to resist wear, not shock, and they fail by shattering rather than by deforming.”
Two tools here supply any: this with five and Robustrue with four. The extra size is 22 mm (0.87 in), and an extension rod comes with it, which is what reaches a recessed wheel nut inside an alloy.
“heavy-duty tungsten steel anvil, an alloy steel hammer head, and a military-grade double-layer ABS housing.” And: “a built-in cooling fan for optimal temperature control.”
The anvil is the shaft the socket sits on and the part that takes every blow; naming its material is more than most listings do, though no anvil retention type is published — the DEWALT and DCA tools both state a hog ring.
A cooling fan is the honest answer to the problem a 10-second auto-shutoff also addresses: a brushless motor at 3,800 rpm under load makes heat, and nothing else on this shelf publishes either feature. “Military-grade” is not a grade.
No fastening or breakaway split — “maximum torque” covers both, which the introduction calls the common mistake on this shelf. No impacts per minute. No anvil retention type. No voltage consistency: the title says 21 V, which is the peak cell voltage of a pack usually sold as 20 V. No platform range — what else takes this battery is not stated. No auto-stop threshold. No warranty term; what is offered is “100% customer service”.
At $99.99 it specifies its three stages better than anything on this shelf and weighs two and a half times what the lightest tool here weighs.
On sale at around $100 on the American Amazon store at the time of checking.
Prices and availability are what Keepa reported on the date this page was updated; both move.
Prices quoted in this text were read on 6 October 2026. The live price is at the top of the page.
| Maximum torque | 900 ft-lb / 1200 N·m stated, without saying fastening or breakaway |
|---|---|
| Stage 1 | 1,800 rpm / 500 N·m |
| Stage 2 | 2,800 rpm / 800 N·m |
| Stage 3 | 3,800 rpm / 1,200 N·m |
| Weight and length | 10 lb (4.5 kg), 16 in body |
| Anvil | Tungsten steel; retention type NOT PUBLISHED |
| Cooling | Built-in fan, plus a 10-second auto-shutoff |
| Protections | Over-current, over-voltage, overheating, short circuit; reverse brake stop |
| Supplied | 2 × 4000 mAh, charger to 70% in 30 min, 5 impact sockets, extension rod, case |
| Socket sizes | 17, 19, 21, 22, 24 mm (0.94 in) — the most on this shelf |
| Platform range | NOT PUBLISHED |
| Impacts per minute | NOT PUBLISHED |
| Amazon reference | B0F8NYXVJP |
| EAN | 0761450939660 |
No. An auto-stop is a cut-out at a resistance the tool decides, not a calibrated torque — there is no figure published for it, and nothing to set to a vehicle’s specification. MAGSEN says it "eliminates the risk of over-tightening damage"; the DEWALT tool on this shelf words the same function as "designed to help prevent" it, which is the honest version. The shelf’s rule holds: "an impact gun loosens wheel bolts, and a torque wrench finishes them."
It depends where the work is. Ten pounds is 4.5 kg (9.9 lb) on a 16-inch body, which is 2.6 times the weight and nearly three times the length of the Robustrue tool on this shelf — and the introduction puts weight third among its criteria "because this is held at arm’s length under a wing". On the ground, at scaffolding or machinery, it is the right tool. Overhead, it is not.
They are complete. MAGSEN publishes a torque and an rpm for each of three settings — 500 N·m at 1,800 rpm, 800 at 2,800, 1,200 at 3,800. On this shelf, DCA publishes torques without rpm, Robustrue publishes rpm without torques, and DEWALT publishes four modes with neither. The published Dong Cheng page says why it matters: the figures are "what makes a selector usable".
Details checked on October 6, 2026.
Scaffolding, machinery and ground-level work where 4.5 kg (9.9 lb) is carried, not held
Amazon reports what buyers took in the month before this page was last checked: at least 1,000.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for garage tools and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
Cordless 18 V · 215 Nm stated · 3300 rpm · two automatic modes · auto shut-off and slow-down · belt clip
The compact one: 215 Nm and 3300 rpm on the 18 V Professional platform, with automatic modes that slow and stop the tool rather than hammering on.
Best for: Someone already on the Bosch Professional platform who wants a compact tool for general work.
≈ $335
520 N·m fastening / 682 N·m loosening, both stated · 4 modes at 350/420/520 + 682 · hog ring · 2 × 4.0 Ah included · 2.0 kg (4.4 lb)
Both torque figures, a torque published for every mode, two 4 Ah batteries — at the lowest price on this shelf.
Best for: A first cordless wrench, bought on published numbers rather than a brand
1030 ft-lb fastening / 1400 ft-lb breakaway, both stated · 4 modes · hog ring anvil · 20V MAX · tool only
The highest cordless torque here, with fastening and breakaway published separately — and no battery in the box.
Best for: A garage that already owns 20V MAX batteries and meets seized suspension bolts
