This Konusschlüssel is high-quality. On the tasteful packaging is written Konusschlüssel, Cr-Mo steel, Made in Taiwan. It is flat, because only a very flat keys I could use. I bought this key to expand the diamond cylinder of my DrillDoctor- drill grinder. The central screw on the grinding cylinder my DrillDoctos was so tight that I did not aufbekam also with all their might, even though I turned from the outset equal to the right. These aluminum screw has a left-hand thread Whitworth. To open it, you have to turn right. The screwdriver with a thick Pozidrive (Phillips) paper and a thick rubber handle with fine knobs did not make it. The Pozidrive recess in the screw head already started to deform. So I measured it and found a cheap 16mm cone wrench in my bike tool with which I was able to keep the other hand behind the cylinder. But the did not fit, he was a bit too small. After a brief filing by eye he was then 0.2 mm too large, wiggling slightly. This 16 mm cone wrench and the wrench provided comic I finally was able to loosen the screw. After removing the grinding cylinder then I realized that instead of the promised 180 fine cylinder of much coarser 100er cylinder was installed. I now feel cheated. Now I have to pay extra about 51 euros for the finer grinding cylinder 180. Because I loop mainly smaller drill diameter. But now I wanted a good, exactly matching Konusschlüssel for my Drill Doctor and I have received with this key also ordered. This cone wrench 15/16 mm of Cr-Mo steel I highly recommend.
