Review on Professional Grade 10Mm Cobalt Steel Twist Drill Bit - Heat Resistant For Stainless Steel And Cast Iron - Straight Shank Design - M35 Grade HSS-CO With 5% Cobalt - 1 Piece by Mariealphonse Seattle
arrived dull, became dull after a few seconds again
I bought the drill to drill out a bolt stuck in a cylinder head.Drill arrived literally dull, not sharp as everybody would expect. Then I sharpened the drill and used it.Drilled less than 1/16 of an inch before it got dull again. No quality at all.
- I haven't used them yet, but they look like they should be very acceptable.
- Heats up quickly and requires frequent cooling, slowing down work
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