Rack A Tiers 42680 Round Multi Tool Hole Saw 4 1 4" Tongue & Groove Bit Super powerful magnet on the SFPC Super powerful magnet on the grip end of the EMF holds the EMF securely even to a vertical surface G Twinning: No Communicating System: No Mounting Options: Standoff The world’s first round multi tool hole saw is here to cut the perfect holes quickly and effectively in drywall or other thin materials like wood or plastic this round hole cutter is ideal for enlarging existing holes or making holes for recessed lights in a fraction of the time it would take with a traditional saw and with much less strain on your wrists and arms