So I bought this to just drill 2 holes to run plastic pipe for connections to my garage to perform . ......It's Chinese crap so I wasn't expecting much but I figured he should be able to handle the two holes I had to drill but he couldn't complete the task... By the time I was finally able to finish the second hole I had basically punched this bit through the last remaining 1/2 inch leaving only a partial edge of the diamond dust bitβ¦β¦So kind of worked but mediocre quality at best