How the KNIPEX Cobra Pliers Features Beat Its Most Notable Copycats

Written by Luis Montes Updated On April 29, 2025

If you’re looking for your first water pump pliers, we at Fortis HD want to help you by narrowing down your otherwise overwhelming Google search to the available makes and models.

On the other hand, if your beloved slip-joint pliers have worn out beyond repair, and you’re willing to move out of your favorite brand comfort zone, we want to break down for you why the KNIPEX Cobra pliers is a no-brainer investment that will upgrade your toolbox and quite possibly make you never consider anything else, as some owners claim on tool and mechanic forums.

In this article, we’ll review the KNIPEX Cobra pliers’s signature features, compare the 10″ QuickSet model with other brands that, at a glance, look alike, and check the test results from a well-known YouTube channel that exposes what makes KNIPEX a better tool overall.

KNIPEX never stops innovating on its product line and is now offering 8 of the most popular Cobra Pliers in a must-have set available at Fortis HD. Check it out.

KNIPEX Cobra Pliers Signature Features

We’ll focus on the KNIPEX Cobra Quickset 10” model # 87 21 250, the latest model as of 2025.

Image source: www.youtube.com/@RealToolReviews.

Unlike the standard version (87 01 250), the 87 21 250 Cobra pliers feature a ratcheting mechanism (improved over the blue button version) that closes the lower jaw by pushing the handle. You open the lower jaw by pressing the button, then push the handle to close it and lock the jaw in place by pulling the lower handle slightly back.

Image source: www.youtube.com/@KNIPEXofficial.

The ratcheting mechanism and slim head profile let you access hard-to-reach areas.

Image source: www.knipex.com.

The jaw and teeth configuration can grip objects of any shape, including flat, round, hexagonal, and square shapes. Due to the teeth’s hardness (more on that later), the KNIPEX Cobra pliers will bite hard, to the point where they can damage brass, chrome, and painted fasteners. The smooth jaws of KNIPEX Wrench pliers would be a better tool for such materials.

The special chrome vanadium electric steel of the KNIPEX Cobra (high-alloy, oil-hardened, tempered steel) makes it a strong, long-lasting, and lightweight tool, which is essential when you need to carry it in a pouch for an extended period.

Image source: www.youtube.com/@OpportunityElectrical.

Unlike most pliers, which feature smooth handle covers that tend to tear and come off over time, the Cobra handle is highly grippy (even with greasy hands) and incredibly durable. Don’t just take our word for granted. Check what Paul_The_Builder, an owner of KNIPEX tools, posted on Reddit about his 10+ year-old pliers handles.

Besides their stickiness, the Cobra handles don’t come together to avoid pinching the user. So, if you’ve experienced that with your current pliers, you can say goodbye to blood blisters.

Image source: www.youtube.com/@ClientGraphics.

Lastly, the self-locking mechanism is a feature KNIPEX likes to showcase, but it isn’t exclusive to the brand. It’s a standard of what a water pump pliers with an aggressive teeth design should do, at the very least.

The Cobra’s self-locking ability is all about the pliers’ teeth angle and basic mechanics.

You grab onto something with the pliers and squeeze both handles while pushing down to make the teeth bite. Due to the teeth’s configuration, they will develop an inward torque force and stay in place.

From that point, pushing the upper handle will make the Cobra bite further without squeezing the lower handle. The downward pushing force will be transmitted to the joint, which will push down and rotate the upper jaw while serving as a support spot for the lower jaw, which will also rotate and bite.

Image source: www.knipex.com.

The self-locking feature allows you to focus on breaking loose stuff instead of wasting energy to prevent the pliers from slipping and rotating. It ensures the operator’s safety and makes work more efficient.

The KNIPEX 10″ Cobra QUICKSET Water Pump Pliers combine the proven Cobra functions of reliable locking of the hinge bolt with an additional push function, which makes it easier to work in very confined and inaccessible areas.

Purchase yours at Fortis HD.

Technical Comparison Against Similar Pliers

Let’s compare the technical specs of the KNIPEX Cobra with similar water pump pliers and contrast their profiles, complete with photos, so you can confirm that the KNIPEX Cobra is the best choice for working in tight areas.

Brand	Article No.	Made in	Max jaw opening (in/mm)	Number of adjustment positions	Handle	Jaw thickness (in/mm)	Weight (lb/grams)
	87 21 250	Germany	2 / 51	25	Non-slip plastic	0.3 / 7.6	0.73 / 335
	D50510B	China	2.125 / 54	12	Plastic dipped	0.3 / 7.6	0.81 / 367
	GV10	China	2.25 / 57	16	Non-slip comfort	0.49 / 12.5	0.95 / 413
	GL10	USA	1.25 / 32	5	Comfort grips	0.39 / 9.9	0.78 / 391
	56748	Taiwan	2 / 51	21	Vinyl dipped	0.31 / 7.9	0.77 / 352

Picture source: www.youtube.com/@ProjectPineHills.

Picture source: www.youtube.com/@RealToolReviews.

Picture source: www.youtube.com/@RedemptionGarage.

Picture source: www.youtube.com/@ToolswithSoAlz

Image sources: www.youtube.com/@ProjectPineHills, www.youtube.com/@RealToolReviews, www.youtube.com/@BenjaminSahlstrom, www.youtube.com/@RedemptionGarage

So, compared to similar joint slip pliers, in most cases, the jaws on the KNIPEX Cobra open wider (regardless of the specs), the profile is the thinnest, and it’s the lightest of all four tools.

In addition to its design, the KNIPEX Cobra’s raw materials and manufacturing process are superior to those of every other water pump plier available, making it perfect for frequent, heavy-duty jobs.

In the next and final section of this post, we’ll share the grip capacity and wear resistance results between the KNIPEX Cobra and several other brands.

The KNIPEX 10″ Cobra Extra-Slim version offers good access to workpieces and tight areas due to the slim construction of the head and joint area.

It’s a must-have complement to the 10″ Cobra QuickSet. Both available at Fortis HD!

A Mind-Blowing Cobra Pliers Comparison

The YouTube channel “Project Farm” conducted an interesting test to determine which pliers grip best the threads of a bolt, a high-carbon steel 1/2″ extension, and a 3/4″ bolt. Finally, they tested the pliers’ damage resistance with an impact wrench that forced a bolt to spin against the teeth for five seconds.

Here are the results:

Conclusion

From the above results, we can conclude two things:

1.- KNIPEX doesn’t cut corners regarding its pliers materials and manufacturing processes.
2.- It isn’t a surprise that so many water pump pliers are “identical” to the KNIPEX Cobra at a fraction of the price.

Granted, manufacturers offer a lifetime warranty for their tools. However, they don’t cover abuse.

Wait a minute, aren’t water pump pliers (by their nature) often abused and used in unintended or even destructive ways? Of course! So, in the end, you’ll either end up in a neverending painful warrant process— as this member of the Electrician Talk forum experienced —to get an equally crappy replacement or be forced to buy a new water pump or tongue and groove pliers.

When you buy a KNIPEX Cobra, you’re investing in a high-quality, cleverly designed, and long-lasting tool with one of the thinnest yet strongest profiles to break loose seized fasteners, round-off fittings, and smooth pipes, even in tight areas.

If you like tool comparisons, our article “IPH Dead Blow Hammers – Engineering Review & Destruction Test” reviews a dead blow hammer that stands miles ahead of its competitors.