Diablo, 9 Piece, BiMetal Hole Saw Kit, Includes 78, 1, 118, 138, 112, 2, 218, 212 2916, Snap Lock Plus Mandrel, Pilot Bit, Adapter Nuts, 12 58, For Quick Easy Hole Saw Changes For Maximum Job Performance, Provide Ultimate Cutting Length Of 238 To Bore Deeper Holes In A Single Pass, Features Variable Tooth Design For Faster Cuts, Universal Snap Lock Plus Mandrel System Fits All Hole Saws In The Range, Including Carbide Tipped Hole Saws, Tool Free Plug Ejection For Fast Material Removal, For Use With Wood Metal