I have to install a molding strip that goes threw a doorway. The molding is a carpet to vinyl set up and the nails they send are for installing the molding. My concern is that I can't find a small enough concrete bit to drill a hole through the floor as it is in the basement.If it was upstairs it wouldn't be a problem it would be wood . Do they make a special bit to install the strip into a concrete floor? I can't find a concrete bit smaller than one eight.