Drill America 3/16" x 6" Cobalt Aircraft Extension Drill Bit, GLBCO Series

Works great for my project

The first one I had ordered snagged and immediate broke in half. Fortunately, Amazon took care of the return easily as usual, and I was able to get a replacement. Once I had the new one, it was able to do the job I needed it for (drilling into an aluminum cylinder head). Other than the initial break, there were no issues with the quality of the bit.

Other than, because I tend to be heavy-handed and impatient, I break them more often than other people, I have no problem with these; I just buy a few at a time and I'm 'off to see the Wizard'.Rating these at four stars seems fair.

Nice little bit, great price!

****

An excellent drill bit and exactly what i needed.

These incredible drill bits were perfect for pre-drilling through heavy metal framing on the interior of our metal storage building as well as on the corners of the double plated metal base. They never dulled or broke after using numerous times to complete this project. I was very impressed by the quality and would highly recommend these bits to get the job done!

I am retired from the aviation corporate jet manufacturing industry. Only the best drill bits were used in the manufacturing of the jets. They last forever, with only sharpening. This drill bit looked and felt exactly that good. Then I used it and WOW, it brought back memories of those highest quality bits. I absolutely know this bit will be with me forever. About time I found a bit that will not dissaspoint after one or two uses. Two thumbs up.