Diablo, 2-1/2", Carbide Tipped Hole Saw, Cuts Both Wood & Metal, Use On Wood, Nail Embedded Wood, Plastic, Aluminum, Metal, Cast Iron & Stainless Steel, Delivers Longer Cutting Life Than Bi-Metal For Faster Cutting Performance & Increased Productivity 2-3/8" Cutting Depth For 40 Percent Deeper Holes In Single Pass & Increased Productivity, Variable Tooth Design For Faster Cuts, Snap Lock Plus Mandrel System For Quick & Easy Changes With No Down Time, Includes: Mandrel, Pilot Bit, 5/8" Threaded Adapter Fits Diameters 1-1/4" To 6" & 1/2" Threaded Adapter Fits Diameters 9/16" To 3-1/16", One Size Fits All Mandrel Fits All Diablo Holes Saws In The Carbide & Bi-Metal Range, From 5/8" To 6" Diameter, Tool Free Plug Ejection For Fast Material Removal.