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Need to drill a 1" hole in a kitchen floor ( mobile home), and thru the sub-floor to accommodate a new 4-wire (aluminum wire) cable (6/3 w/gd) for a kitchen range. Not sure if it's a floor covering like linoleum or similar because the "tiles" are shallow, but when I tap it with a tool, it sounds like real tile. Linoleum (or whatever) with real tile surface squares?