Lenox, 1-1/8", 29mm, Bi Metal, Hole Saw, 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 Faster & Easier, Use 1L, 4L, 5L Standard Arbor Or 5L Snap Back Arbor.