Review on 8 Inch Cobalt Jobber Length Stainless by Keith Gonzales

I've never had this type of bit before. I was trying to drill out a head on a hardened screw. I used a titanium coated drill bit and it was very slow and heat was an issue (even when applying oil). Insert these bits and load one into my drill Viola! Drilled through with no problems. It was fast. It's a matter of seconds as I spent many minutes working on this screw with another drill and made minimal progress.