Hole Saw Kit, Bimetal Industrial/MRO, M3 High Speed Steel Cutting Edge with Hardened Steel Backer, Number of Pieces 19, Max Cutting Depth 1 1/2 In, Thread Size 1/2-20 And 5/8-18 In, For Wood Or Metal Doors, Light Gauge Sheet metal & Mild Steel, Includes 3/4, 7/8, 1 1/8, 1 3/8,1 1/2, 1 3/4 , 2 , 2 1/4, 2 1/2 , 3 , 3 1/4, 3 5/8, 3 3/4, 4 1/4, 4 1/2 Inch Hole Saws, 3 Arbors 12 Inch Extension And Metal Case