Hole Saw Kit, 16pc Set with Case, National Standard Products&reg; (Full Size) Saw Size: 3/4", 7/8", 1 1/8", 1 1/4", 1 1/2", 1 3/4", 2",2 1/2", 3", 3 1/2", 4", 5". Carbon Steel, Heat Treated Construction, Suitable For Wood, Thin Sheet Alloy & Thin Sheet Metal Thick backing plate prevents thread stripping and increases torque Blow Molded Case Included. National Standard Products