SAW HOLE 4-1/8" BIMETALLenox 4 1 8 inch 105mm Bi Metal Hole Saw Vari Tooth Design Positive Rake Tooth Shock Resistant Teeth For Both Wood and Metal Cutting Deep Aggressive Cutting Action Speed Slot Design Makes Removing The Plug Faster and Easier Use 2L 3L 6L 7L Standard Arbor Or 2L 6L Snap Back Arbor. Features Vari tooth design Positive rake tooth Shock resistant teeth for both wood & metal cutting Deep aggressive cutting action Speed slot design makes removing the plug