Abstract: A hole saw alignment guide for enlarging a hole in an object to provide a larger diameter hole in the object. The hole saw guide includes a first cylindrical part having a first end adapted to the size of, and adapted to be inserted into, the hole that is to be enlarged. The hole saw guide also has a second cylindrical part integral with the second end of the first cylindrical part. The hole saw guide is adapted to receive over the outer surface of the first cylindrical part a toothed end of a hole saw sized to provide the larger diameter hole. The second cylindrical part is adapted to extend into an arbor of the hole saw and to be secured to the arbor for rotation with the hole saw. The arbor of the hole saw is adapted to be received in a drill chuck.