BEST OVERALL: DeWalt Rapid Load Carbide Masonry ... We had high hopes for Neiko’s Diamond Hole Saw Bits, but they didn’t live up to our standards. This bit set is marketed as having diamond ...

They have two or three teeth on a platform with a pilot bit. To cut out a hole of any size they need to be adjusted to the proper position. Circle cutters can make larger circles than adjustable hole ...