About Us

Prüfengel offers authentic consumer tests in which real users share their experiences with products. Our tests are based on practical applications in everyday life and reflect the opinions of consumers. As we focus on consumer tests, we do not carry out any material, long-term or laboratory tests. The tests are carried out by 1-2 independent consumers over a period of 7-14 days. The exact test conditions can be viewed in the test plan of the respective test report – click here to go directly to the test plan.

Manufacturers provide the tested products free of charge. We charge a one-off test fee for carrying out the tests. In addition, manufacturers pay an annual licence fee for the use of the Prüfengel seal. We also receive a commission for linking to manufacturers’ websites. These remunerations have no influence on our test results or ratings.

We guarantee transparency and a fair evaluation. For a detailed insight into our comprehensive evaluation process, please click here.

Qtools
Fan disc

The flap disc from Q Tools comes in a subtle blue shade and impresses with its simple elegance.
The 125 mm flap discs are for use or as an accessory for an angle grinder. The diameter is 125 millimetres. Thanks to the T-29 shape, the ergonomics are excellent.
The flap disc is ideal for reliable grinding, polishing, smoothing and surface treatments such as the processing of weld seams.
The 125 mm flap disc impresses with its stable performance and long service life. All in all, the flap disc from Q Tools offers quality for every application. This flap disc enables effective sanding.

Advantages

✅ Extensive scope of delivery
✅ High sanding performance
✅ Fits all standard angle grinders
✅ Various grit sizes

Disadvantages

❌ None

The first impression

Packaging and contents

ℹ️ Here we take a closer look at packaging. Sustainability is becoming an increasingly important factor. In addition, adequate protection of the product must of course also be guaranteed. Are the contents of the packaging complete and does the manufacturer make it as easy as possible for me to use the product straight away?

CriterionRemarkScore achieved*
Product protectionCarton is sturdy, product sufficiently protected100 points
Sustainability PackagingNo superfluous packaging materials were used in order to reduce waste.100 points
Package contents & scope20 serrated lock washers100 points
Instructions for useProduct is largely self-explanatory, brief instructions would be desirable90 points
Total98 points
Weighting: 20%
*The maximum score is 100 points

The serrated lock was delivered in a sturdy cardboard box, which was undamaged and easy to open. The serrated lock was packed in product packaging, which protects the product from damage and thus ensures comprehensive product protection. Brief instructions for use would be desirable, although the use is self-explanatory for professionals. The product packaging is fully recyclable. The serrated lock washer makes a very good impression at first glance. The compact design of the packaging helps to minimize waste and leaves no room for superfluous packaging material or unnecessary advertising flyers. In addition, EN 13743 is printed on each fan disk.

The first time in your hand

Product processing and appearance

ℹ️ Before we start the practical test, we take a close look at the workmanship of the products. How high quality are the materials used? Are the look and feel satisfactory?

CriterionRemarkScore achieved*
Visual appearanceVery good visual appearance100 points
ProcessingVery good workmanship100 points
StabilitySufficient stability100 points
Sustainability of the productNo information on sustainability, but high-quality and durable materials70 points
Total93 points
Weighting: 20%
*The maximum score is 100 points
The serrated lock washers are ready for the practical test.

The flap disc from Q Tools not only impresses with its pleasant appearance, but also with its excellent handling. The careful workmanship of the serrated lock washer is clearly visible, as it is stable and dimensionally stable , which indicates a long service life. Unfortunately, the manufacturer does not provide any further information on the sustainability of the serrated lock washer. It would be desirable to have more transparency and details on this important aspect in order to be able to make an informed decision.

This is what our practical test showed

Does the manufacturer keep its advertising promises?

ℹ️ Our practical test has the highest relevance and therefore weighting. Here, the product has to undergo a wide range of criteria and tests. We check the functions and product promises of the test article.

CriterionRemarkScore achieved*
Barrel of the cut-off wheelRuns largely smoothly without imbalance90 points
DurabilitySufficient durability90 points
Possible applicationsVersatile application100 points
EffectiveVery effective100 points
PerformanceHigh sanding performance100 points
Total96 points
Weighting: 45%
*The maximum score is 100 points

Handling the flap disc from Q Tools is extremely simple and straightforward. In our test, the flap disc was used with an angle grinder. Sanding was effortless and quick, with impressive results. The stability of the material not only ensures a high load capacity, but also makes the flap disc remarkably robust, especially when sanding metal.
The versatility of the flap disc is reflected in its wide range of possible applications. It is compatible with angle grinders with a diameter of 115 mm and a standard bore of 22 to 23 mm. It is also compatible with cordless flex and many other devices. However, it is important to note that the grit of the flap disc should be selected according to individual requirements in order to achieve optimum performance.
Another outstanding aspect is the durability of the flap disc due to the use of high-quality materials. The robust nature of the material promises long-term use without significant wear.
In summary, the serrated lock washer from Q Tools is a well thought-out, stable and aesthetic solution for a wide range of applications that meets expectations in terms of quality and functionality. It is ideal for continuous professional use, whether for removing rust from the car or for cavity sealing as a supplement to the bodywork tool.

Price/performance ratio

and ratings from consumers

ℹ️ Finally, we examine how the product compares to the competition. Can it keep up with the competition in terms of price and quality? Would we generally recommend buying it? We also look at the consumer reviews and check whether the critical and positive reviews are actually justified.

CriterionRemarkScore achieved*
Price / performance ratioVery good performance in the mid-price segment80 points
Rating cutNot rated, after still too few customer reviews
Total80 points
Weighting: 15%
*The maximum score is 100 points

Prices of up to €52 are charged on the Internet for equivalent products. Very inexpensive products are available from as little as €14 . The serrated lock washer from Q Tools is therefore currently in the middle price segment with a price of € 27.35. For the quality and performance received, the price-performance ratio is very good.

Overall result

WeightingScore achieved*
1. packaging & contents20%98 points
2. product processing & appearance20%93 points
3. in the practical test45%96 points
4. price/performance & consumer ratings15%80 points
Total93 points
*The maximum score is 100 points
Fan disc
 of the brand 
Qtools
achieved
93
Points in our test and therefore passed. The test was carried out in the test period
03/24
and is stored in our database under the licence number
240305014
. Further information on our test procedure can be found at www.pruefengel.de/testverfahren.

The practical tests are based on careful observations and do not include long-term or laboratory tests. The test judgements reflect the personal impressions and opinions of the testers who try out the products in everyday use. We would like to emphasise that these evaluations do not claim to be exhaustive and may reflect both subjective and objective impressions. The evaluations are made to the best of our knowledge and belief, without any liability being assumed for the accuracy or completeness of the test results. It is important to note that our tests are not based on legal requirements, medical effects or specific ingredients of the products. We rely on the advertising claims and information provided by the manufacturers, but use of the information is always at your own risk. Our efforts are aimed at ensuring a serious and thorough testing procedure, which has been developed in a long and professional process in close co-operation with our testers.

The practical tests are based on careful observations and do not include long-term or laboratory tests. The test judgements reflect the personal impressions and opinions of the testers who try out the products in everyday use. We would like to emphasise that these evaluations do not claim to be exhaustive and may reflect both subjective and objective impressions. The evaluations are made to the best of our knowledge and belief, without any liability being assumed for the accuracy or completeness of the test results. It is important to note that our tests are not based on legal requirements, medical effects or specific ingredients of the products. We rely on the advertising claims and information provided by the manufacturers, but use of the information is always at your own risk. Our efforts are aimed at ensuring a serious and thorough testing procedure, which has been developed in a long and professional process in close co-operation with our testers.

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Evaluation process

You can find a detailed insight into our evaluation process, which forms the basis for our product ratings, here:

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