This masonry drill bit is tungsten carbide so, it's the rel deal, you don't have to worry about it breaking g off in the concrete, brick or whatever masonry material you're drilling. I didnt see the "18" in the "18.11" inch, i only saw the 11 so, i was shocked at how long it was until I went back and looked. This was a life saver when I went to put up the post for a shade sail at our beach house. I'm a fairly small gal and sometimes have a hard time putting enough grit behind a drill but, had no issues. Worked great with one of our Milwaukee hammer drillsand I had the post up securely in place in no time with little to no wear showing on the bit
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