IRWIN Lettered and Numbered Drill Bits information:
Letter and numbered drill bits were developed to make up the gaps in betwee... read more
When would I use a tap and die set and how would I properly use them?
Tap and dies are metal threading tools. Taps make internal threads inside a... read more
Are Irwin cobalt drill bits coated like the titanium ones? If the cobalt bits are rockwell hardness 66 - 67 HRc, what hardness are the titanium bits? Once you sharpen a cobalt bit and the gold coating is gone, is it just a regular bit?
Cobalt bits are not coated, they are cobalt steel through and through. At t... read more