Fast Chip Removal Hole Saw

A rotary tool accessory comprising:

• a base;
• a circular wall extending upwardly from the base about a central axis, the circular wall including an inner face, an outer face and a circular rim extending between the inner face and the outer face;
• a first cutting group including
• a first inwardly extending tooth extending from a location directly above the circular wall to a location closer to the central axis than the inner face,
• a first outwardly extending tooth extending from a location directly above the circular wall to a location farther from the central axis than the outer face, and
• a first gullet extending downwardly from the rim toward the base;
• a second cutting group including
• a second inwardly extending tooth extending from a location directly above the circular wall to a location closer to the central axis than the inner face,
• a second outwardly extending tooth extending from a location directly above the circular wall to a location farther from the central axis than the outer face, and
• a second gullet extending downwardly from the rim toward the base;
• and
• a first toothless expanse of the rim extending between the first cutting group and the second cutting group.