Advantage: Up to 5 times faster than standard bi-metal hole saw for drill wood. Up to 10 times more cuts than standard bi-metal hole saw for drill wood. Replaced the following drill bits: spade bit, forstner bit, auger bit, bi-metal hole saw, diamond hole saw. Max cutting depth: 6.6” (167 mm). Ideal drill for multiple materials: hard wood (not with nail), hardy plank, MDF, fiberglass, wall tile, air brick, plasterboard, for thick wall, roof. Note: Cutting material hardness: Not up to 6. For use in standard rotary drills, not for use in hammer mode. Package: 1 of 4-3/4” 121 mm hole saw cutter (red or black), 1 of mandrel for 1/2” chuck, 1 of silver pilot drill bit for wood. Ideal drill for multiple materials for hard wood (not with nail), hardy plank, MDF, fiberglass, wall tile, air brick, plasterboard, for thick wall, roof.