LENOX Bi-Metal Speed Slot Hole Saw With T3 Technology, Plumber'S Kit, 17 Piece New LENOX Bi-Metal Hole Saws deliver up to 50% longer life* with a proprietary toothform that cuts common construction materials more efficiently. Compatible with both quick change and traditional non-quick change arbors**. New LENOX Step Bit Pilot Drills make holes in metal with less hole saw grabbing and up to 50% fewer breaks***. The patent-pending design eliminates the need for predrilling, feeding the saw into the material without slamming. Compatible with both quick change and traditional non-quick change arbors****. *vs previous generation LENOX Bi-Metal Hole Saw drilling low carbon steel.**Excluding proprietary arbor systems that require adapters. ***vs previous generation LENOX Pilot Drill drilling low carbon steel.****Excluding proprietary arbor systems not using standard 1/4" shank pilot drills.