Review on High-Heat-Resistant 14Mm Cobalt Steel Drill Bit With Straight Shank For Cutting Stainless Steel And Cast Iron - 1Pc, Grade M35 HSS-CO With 5% Cobalt Content by James Ssims
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.
- Cobalt Steel - Manufactured From M35 5% Cobalt Steel, With Molybdenum And Cobalt Added To Creates A Hardened Alloy, Measuring Rockwell Hardness Up To 65, For Much Faster Cutting And Extra Longer Life Span, With Up To 10 Times When Compared with an Average HSS Drill Bit.
- The bit may be too loud or obnoxious during use, disrupting others in the vicinity or leading to complaints from neighbors
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