Review on ACTOOL Double Spiral Industrial Drill Cutting Tools by Brian Kumar

I don't know how much Hype to believe this twist step drill but after using it to drill out some wing washers to fit a larger screw I have to say the cutting action is really improved over the standard step drill and the spiral pattern seems better at clearing chips than a standard -Step drill bits. The diameter markings are easy to read and the quality of the bit looks good. I expect the high speed steel material that makes up this bit will last longer than typical titanium coated step bits. Although it compares to the standard step drill bit sets that you can get from the port is expensive, I would expect them to last 3-4 times longer.