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Review on Cobalt Drill Diameter Drilling Aluminum by Pius Aponte
I had to sharpen it myself before it worked
tries to drill approx. 1.5 mm thick stainless steel. I tried 2 bits and none of them drilled, so I hand sanded one and drilled lightly through the stainless steel. That's why I avoid coated bits - unlike these, they can be sharpened! the price was fair and the material is good and i know how to sharpen a drill.
Pros
- made of M35 steel, contains 5% cobalt, high hardness, stable operation
Cons
- questionable purchase for older people
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