Feature:1. ACCURATE CUT: The hole saw's excellent concentricity reduces runout and vibration, ensuring smooth, accurate cuts.2. FASTER AND SMOOTHER: Racks create a strong bite when in contact with irregular surfaces, resulting in fast drilling, faster and smoother cuts and less torsion build up.3. HSS MATERIAL: High speed steel is a tool steel with high hardness, high wear resistance and high heat resistance, and the hole opener made of it has a long service life.4. VARIOUS SPECIFICATIONS: There are 11 hole saws with different specifications in the set, which can meet your precise hole opening needs.5. WIDE APPLICATION: Hole saws can be used on a variety of materials, including aluminum, non ferrous metals, stainless steel sheet, steel pipe, cork, hardwood, plywood, particleboard.Specification:Item Type: Hole Saw KitMaterial: HSSSpecification: 11 x Hole Saw,1 x Twist Drill Bit A2,1 x Twist Drill Bit A4,1 x Extension BarAperture:Approx. 19mm / 0.7inApprox. 22mm / 0.9inApprox. 25mm / 1inApprox. 29mm / 1.1inApprox. 35mm / 1.4inApprox. 38mm / 1.5inApprox. 44mm / 1.7inApprox. 51mm / 2inApprox. 57mm / 2.2inApprox. 64mm / 2.5inApprox. 76mm / 3in Package List:11 x Hole Saw1 x Extension Bar2 x Twist Drill Bit1 x Storage BoxNote:Pay attention to correct operation