Although the product looks a bit different than on the Amazon image (handles black instead of blue, box with glued label, see customer images), but it is undoubtedly 1A-Ware, new and not superimposed as the 6 Famex-files (also of Amazon), I got in a torn plastic bag on the same day and were corroded.
This diamond files are intended for micro work as model making or jewelry-making, they are as thin as needle files, even shorter and still smaller than Key Files. You have no handles, except for a soft plastic coating of thin stem, which is nearly as thin as a matchstick.
Accordingly uncomfortable is the ergonomics. The force is transmitted only by the thumb and forefinger on an extremely small area of the tool. That is indeed the precision,
but requires power, eg when grinding steel knife, you have the finger on this very small area strongly proofs both to cause removal of material as a firm leadership, which quickly leads to cramps and bruises.
When new, the filing feeling of something scratchy or edged, ie they have not really bite, tend to fly over the material, to swim, to dance.
This requires a very strong leadership with a fingernail and great care, because they slide sideways slightly off track.
That improves when they are retracted. The diamond surface is not as edgy as bumpy asphalt, the files "dance" is not as much, then lie on the rich material and bite firmly better working softer, lighter and more efficient.
With brass, aluminum, steel, horn, plastics and materials Campound the files are finished playing. For fibrous woods they are not created for key and Needle Files from workshop steel or better precision files should forth.
Even the popular knife steel 12C27 of Sandwik (well above 50 HRC) is a challenge for the stocked with diamond dust surface only at the beginning. After 4-5 strokes can be driven with pressure and the removal of material takes place in fair measure. The guide is much easier, the tool fits comfortably in your car and has rich contact with the material.
However, one should not be surprised, the bat is coarser than it looks equivalent, in new condition into something a sandpaper with less than 240-360 grit he at gradual decrease of pressure and time. I guess it ends up relatively quickly at 600 he, what is an excellent compromise between performance and surface appearance, especially with small works. UU satisfy a few strokes with 1000 grit sandpaper (wrapped around the stem) to achieve a satin finish.
Boning, round edges, expanding holes, notches milling, slightly change measure and increase precision fit in the hundredths range, but these tools are just right, and it's fun to work with, just not for hours, not for serial work on small parts.
The stability of naturally depends on the material, the working pressure and operating hours. Of course you can not expect miracles for the price. I also think that cutler world class other tools for Guillochage (Verzierrungen on back of spring and blades) use, as one can see from work videos.
With sample working with hard tool steel I have to wear visually examined and found only steel and no traces of abrasives. I can imagine well that for me make as modelers, these files when working with brass or aluminum, over several years of good service. That might be different when working on the hard steel of Laguiole knives in my collection, but even then the purchase price is paid at the low price.
Therefore, I forgive 5 stars, no way regret the purchase and these parts would recommend this to a friend with a clear conscience.
