Diablo, 3/8", Hole Saw Mandrel Arbor, Snap Lock Hole Saw Mandrel With 3/8" Hex Arbor, 4" Pilot Bit, 1/2" Adapter Nut & 5/8" Adapter Nut, Hole Saw System & Mandrel Design Simplify The Attachment Process For Fast & Efficient Hole Saw Mounting, Features 2-3/8" Cutting Depth For Deeper Holes In One Pass, Tool-Free Plug Ejection, Perma-Shield Coating For Reduced Friction & Heat, Variable Tooth Design, 1 Size Fits All Mandrel Fits All Diablo Hole Saws.