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
IRWIN Taps & Dies information:
We carry only a few high speed steel taps or dies. The key identifier is th... 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