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Old 04-20-2008, 07:25 PM
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cobalt drill bits 8% ???

i am looking to buy some cobalt bits from MAC tools. but i am confused by the 8% thing, never heard of that before. are they any good ?

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Old 04-20-2008, 07:40 PM
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I have a lot of Mac tools but not drill bits. The best drill bits that I have ever used are cobalt drill bits made by the Hanson Company. They are pricy, but well worth it.
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Old 04-22-2008, 08:24 PM
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so. nobody has heard of 8% colbalt content drill bits ? well, neither have i.
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Old 04-22-2008, 08:38 PM
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This might help.............

http://irwin.com/irwin/consumer/jhtm....xml&asked=yes
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Old 04-22-2008, 10:16 PM
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The MAC cobalt bits are HSS bits alloyed with cobalt. They are good bits. Plus our MAC rep replaces broken ones for free. They can be resharpened to new condition too. They are silver in color, some say a tad goldish too.
Places like Harbor Freight sell cobalt "coated" bits. They are cheap steel bits with a red/blue/purple rainbow appearance from the coating. Don't bother. To be fair they also sell cobalt alloy bits too, but I haven't tried them.
I've found titanium coated bits are worth having around for jobs that don't require the expensive cobalts. Once the coating is worn or sharpened away from the tips they're just plain HSS bits though. I tend to save my cobalt bits for tough stuff like drilling out broken exhaust studs.
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Old 04-23-2008, 08:24 PM
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i read speedydudes link, and then googled. i found the 8% thing is normal and par. so i'm buyin them. even though i could get more bits for a few bucks more online. but, they are lifetime warranty = break em and they are replaced, hard to beat that.
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